diff --git a/package.json b/package.json
index 84b0530..aa642d7 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,7 @@
     "@playwright/test": "1.48.2",
     "chai": "4.5.0",
     "chai-as-promised": "7.1.1",
-    "eslint": "9.14.0",
+    "eslint": "9.18.0",
     "eslint-config-prettier": "9.0.0",
     "eslint-plugin-prettier": "5.2.1",
     "globals": "^15.12.0",
diff --git a/yarn.lock b/yarn.lock
index 812f42c..31669d0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1214,21 +1214,23 @@
   resolved "https://registry.yarnpkg.com/@eslint-community/regexpp/-/regexpp-4.12.1.tgz#cfc6cffe39df390a3841cde2abccf92eaa7ae0e0"
   integrity sha512-CCZCDJuduB9OUkFkY2IgppNZMi2lBQgD2qzwXkEia16cge2pijY/aXi96CJMquDMn3nJdlPV1A5KrJEXwfLNzQ==
 
-"@eslint/config-array@^0.18.0":
-  version "0.18.0"
-  resolved "https://registry.yarnpkg.com/@eslint/config-array/-/config-array-0.18.0.tgz#37d8fe656e0d5e3dbaea7758ea56540867fd074d"
-  integrity sha512-fTxvnS1sRMu3+JjXwJG0j/i4RT9u4qJ+lqS/yCGap4lH4zZGzQ7tu+xZqQmcMZq5OBZDL4QRxQzRjkWcGt8IVw==
+"@eslint/config-array@^0.19.0":
+  version "0.19.1"
+  resolved "https://registry.yarnpkg.com/@eslint/config-array/-/config-array-0.19.1.tgz#734aaea2c40be22bbb1f2a9dac687c57a6a4c984"
+  integrity sha512-fo6Mtm5mWyKjA/Chy1BYTdn5mGJoDNjC7C64ug20ADsRDGrA85bN3uK3MaKbeRkRuuIEAR5N33Jr1pbm411/PA==
   dependencies:
-    "@eslint/object-schema" "^2.1.4"
+    "@eslint/object-schema" "^2.1.5"
     debug "^4.3.1"
     minimatch "^3.1.2"
 
-"@eslint/core@^0.7.0":
-  version "0.7.0"
-  resolved "https://registry.yarnpkg.com/@eslint/core/-/core-0.7.0.tgz#a1bb4b6a4e742a5ff1894b7ee76fbf884ec72bd3"
-  integrity sha512-xp5Jirz5DyPYlPiKat8jaq0EmYvDXKKpzTbxXMpT9eqlRJkRKIz9AGMdlvYjih+im+QlhWrpvVjl8IPC/lHlUw==
+"@eslint/core@^0.10.0":
+  version "0.10.0"
+  resolved "https://registry.yarnpkg.com/@eslint/core/-/core-0.10.0.tgz#23727063c21b335f752dbb3a16450f6f9cbc9091"
+  integrity sha512-gFHJ+xBOo4G3WRlR1e/3G8A6/KZAH6zcE/hkLRCZTi/B9avAG365QhFA8uOGzTMqgTghpn7/fSnscW++dpMSAw==
+  dependencies:
+    "@types/json-schema" "^7.0.15"
 
-"@eslint/eslintrc@^3.1.0", "@eslint/eslintrc@^3.2.0":
+"@eslint/eslintrc@^3.2.0":
   version "3.2.0"
   resolved "https://registry.yarnpkg.com/@eslint/eslintrc/-/eslintrc-3.2.0.tgz#57470ac4e2e283a6bf76044d63281196e370542c"
   integrity sha512-grOjVNN8P3hjJn/eIETF1wwd12DdnwFDoyceUJLYYdkpbwq3nLi+4fqrTAONx7XDALqlL220wC/RHSC/QTI/0w==
@@ -1243,32 +1245,28 @@
     minimatch "^3.1.2"
     strip-json-comments "^3.1.1"
 
-"@eslint/js@9.14.0":
-  version "9.14.0"
-  resolved "https://registry.yarnpkg.com/@eslint/js/-/js-9.14.0.tgz#2347a871042ebd11a00fd8c2d3d56a265ee6857e"
-  integrity sha512-pFoEtFWCPyDOl+C6Ift+wC7Ro89otjigCf5vcuWqWgqNSQbRrpjSvdeE6ofLz4dHmyxD5f7gIdGT4+p36L6Twg==
+"@eslint/js@9.18.0", "@eslint/js@^9.15.0":
+  version "9.18.0"
+  resolved "https://registry.yarnpkg.com/@eslint/js/-/js-9.18.0.tgz#3356f85d18ed3627ab107790b53caf7e1e3d1e84"
+  integrity sha512-fK6L7rxcq6/z+AaQMtiFTkvbHkBLNlwyRxHpKawP0x3u9+NC6MQTnFW+AdpwC6gfHTW0051cokQgtTN2FqlxQA==
 
-"@eslint/js@^9.15.0":
-  version "9.16.0"
-  resolved "https://registry.yarnpkg.com/@eslint/js/-/js-9.16.0.tgz#3df2b2dd3b9163056616886c86e4082f45dbf3f4"
-  integrity sha512-tw2HxzQkrbeuvyj1tG2Yqq+0H9wGoI2IMk4EOsQeX+vmd75FtJAzf+gTA69WF+baUKRYQ3x2kbLE08js5OsTVg==
-
-"@eslint/object-schema@^2.1.4":
+"@eslint/object-schema@^2.1.5":
   version "2.1.5"
   resolved "https://registry.yarnpkg.com/@eslint/object-schema/-/object-schema-2.1.5.tgz#8670a8f6258a2be5b2c620ff314a1d984c23eb2e"
   integrity sha512-o0bhxnL89h5Bae5T318nFoFzGy+YE5i/gGkoPAgkmTVdRKTiv3p8JHevPiPaMwoloKfEiiaHlawCqaZMqRm+XQ==
 
-"@eslint/plugin-kit@^0.2.0":
-  version "0.2.4"
-  resolved "https://registry.yarnpkg.com/@eslint/plugin-kit/-/plugin-kit-0.2.4.tgz#2b78e7bb3755784bb13faa8932a1d994d6537792"
-  integrity sha512-zSkKow6H5Kdm0ZUQUB2kV5JIXqoG0+uH5YADhaEHswm664N9Db8dXSi0nMJpacpMf+MyyglF1vnZohpEg5yUtg==
+"@eslint/plugin-kit@^0.2.5":
+  version "0.2.5"
+  resolved "https://registry.yarnpkg.com/@eslint/plugin-kit/-/plugin-kit-0.2.5.tgz#ee07372035539e7847ef834e3f5e7b79f09e3a81"
+  integrity sha512-lB05FkqEdUg2AA0xEbUz0SnkXT1LcCTa438W4IWTUh4hdOnVbQyOJ81OrDXsJk/LSiJHubgGEFoR5EHq1NsH1A==
   dependencies:
+    "@eslint/core" "^0.10.0"
     levn "^0.4.1"
 
-"@govuk-one-login/di-ipv-cri-common-express@6.4.1":
-  version "6.4.1"
-  resolved "https://registry.yarnpkg.com/@govuk-one-login/di-ipv-cri-common-express/-/di-ipv-cri-common-express-6.4.1.tgz#9bf24aa948cf952d87fcc118669d2d986566a073"
-  integrity sha512-GEiQp49aZcOZ3xGxKyahlleZ2o8ce4exD/o1HOZ+8tTnCl85ju4VuMVUYFvvgHrKgztbZ2klQ5dSWpvnAFTfHg==
+"@govuk-one-login/di-ipv-cri-common-express@8.1.0":
+  version "8.1.0"
+  resolved "https://registry.yarnpkg.com/@govuk-one-login/di-ipv-cri-common-express/-/di-ipv-cri-common-express-8.1.0.tgz#9d97a90742638f85fec5cc87ec902facd172f560"
+  integrity sha512-xdwZDPtijFC5F2GtUvllgNSTkOEjQGwFeTUcq9+ZCnqYJMZiwU6jDHvfc6ar26yh6iUqASsyLD9J5UzuD/szew==
   dependencies:
     hmpo-logger "7.0.1"
     i18next "23.8.1"
@@ -1298,6 +1296,13 @@
     forwarded-parse "^2.1.2"
     pino "^8.20.0"
 
+"@govuk-one-login/frontend-vital-signs@0.1.1":
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/@govuk-one-login/frontend-vital-signs/-/frontend-vital-signs-0.1.1.tgz#f69f29be7485242cf80628b207a3d2901c7aff2e"
+  integrity sha512-9Arrv4ePlDorGJu9BEHmDtiTNLyACFRqwupJMfACqRIldyBYTXvjswBTWaeCaurP0j2eGnBS098ReGrUSNj5Hw==
+  dependencies:
+    pino "^8.20.0"
+
 "@hapi/hoek@^9.0.0":
   version "9.3.0"
   resolved "https://registry.npmjs.org/@hapi/hoek/-/hoek-9.3.0.tgz"
@@ -1333,7 +1338,7 @@
   resolved "https://registry.yarnpkg.com/@humanwhocodes/retry/-/retry-0.3.1.tgz#c72a5c76a9fbaf3488e231b13dc52c0da7bab42a"
   integrity sha512-JBxkERygn7Bv/GbN5Rv8Ul6LVknS+5Bp6RgDC/O8gEBU/yeH5Ui5C/OlWrTb6qct7LjjfT6Re2NxB0ln0yYybA==
 
-"@humanwhocodes/retry@^0.4.0":
+"@humanwhocodes/retry@^0.4.1":
   version "0.4.1"
   resolved "https://registry.yarnpkg.com/@humanwhocodes/retry/-/retry-0.4.1.tgz#9a96ce501bc62df46c4031fbd970e3cc6b10f07b"
   integrity sha512-c7hNEllBlenFTHBky65mhq8WD2kbN9Q6gk0bTk8lSBvc554jpXSkST1iePudpt7+A/AQvuHs9EMqjHDXMY1lrA==
@@ -2897,10 +2902,10 @@ cross-spawn@^6.0.5:
     shebang-command "^1.2.0"
     which "^1.2.9"
 
-cross-spawn@^7.0.0, cross-spawn@^7.0.2, cross-spawn@^7.0.3:
-  version "7.0.3"
-  resolved "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.3.tgz"
-  integrity sha512-iRDPJKUPVEND7dHPO8rkbOnPpyDygcDFtWjpeWNCgy8WP2rXcxXL8TskReQl6OrB2G7+UJrags1q15Fudc7G6w==
+cross-spawn@^7.0.0, cross-spawn@^7.0.3, cross-spawn@^7.0.6:
+  version "7.0.6"
+  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-7.0.6.tgz#8a58fe78f00dcd70c370451759dfbfaf03e8ee9f"
+  integrity sha512-uV2QOWP2nWzsy2aMp8aRibhi9dlzF5Hgh5SHaB9OiTGEyDTiJJyx0uy51QXdyWbtAHNua4XJzUKca3OzKUd3vA==
   dependencies:
     path-key "^3.1.0"
     shebang-command "^2.0.0"
@@ -2922,10 +2927,10 @@ debug@2.6.9:
   dependencies:
     ms "2.0.0"
 
-debug@4, debug@^4.1.0, debug@^4.1.1, debug@^4.3.2, debug@^4.3.4, debug@^4.3.5, debug@^4.3.6, debug@~4.3.4:
-  version "4.3.7"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-4.3.7.tgz#87945b4151a011d76d95a198d7111c865c360a52"
-  integrity sha512-Er2nc/H7RrMXZBFCEim6TCmMk02Z8vLC2Rbi1KEBggpo0fS6l0S1nnapwmIi3yW/+GOJap1Krg4w0Hg80oCqgQ==
+debug@4, debug@^4.1.0, debug@^4.1.1, debug@^4.3.1, debug@^4.3.2, debug@^4.3.4, debug@^4.3.5, debug@^4.3.6:
+  version "4.4.0"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-4.4.0.tgz#2b3f2aea2ffeb776477460267377dc8710faba8a"
+  integrity sha512-6WTZ/IxCY/T6BALoZHaE4ctp9xm+Z5kY/pzYaCHRFeyVhojxlrm+46y68HA6hr0TcwEssoxNiDEUJQjfPZ/RYA==
   dependencies:
     ms "^2.1.3"
 
@@ -2936,10 +2941,10 @@ debug@^3.2.7:
   dependencies:
     ms "^2.1.1"
 
-debug@^4.3.1:
-  version "4.4.0"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-4.4.0.tgz#2b3f2aea2ffeb776477460267377dc8710faba8a"
-  integrity sha512-6WTZ/IxCY/T6BALoZHaE4ctp9xm+Z5kY/pzYaCHRFeyVhojxlrm+46y68HA6hr0TcwEssoxNiDEUJQjfPZ/RYA==
+debug@~4.3.4:
+  version "4.3.7"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-4.3.7.tgz#87945b4151a011d76d95a198d7111c865c360a52"
+  integrity sha512-Er2nc/H7RrMXZBFCEim6TCmMk02Z8vLC2Rbi1KEBggpo0fS6l0S1nnapwmIi3yW/+GOJap1Krg4w0Hg80oCqgQ==
   dependencies:
     ms "^2.1.3"
 
@@ -3240,26 +3245,26 @@ eslint-visitor-keys@^4.2.0:
   resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-4.2.0.tgz#687bacb2af884fcdda8a6e7d65c606f46a14cd45"
   integrity sha512-UyLnSehNt62FFhSwjZlHmeokpRK59rcz29j+F1/aDgbkbRTk7wIc9XzdoasMUbRNKDM0qQt/+BJ4BrpFeABemw==
 
-eslint@9.14.0:
-  version "9.14.0"
-  resolved "https://registry.yarnpkg.com/eslint/-/eslint-9.14.0.tgz#534180a97c00af08bcf2b60b0ebf0c4d6c1b2c95"
-  integrity sha512-c2FHsVBr87lnUtjP4Yhvk4yEhKrQavGafRA/Se1ouse8PfbfC/Qh9Mxa00yWsZRlqeUB9raXip0aiiUZkgnr9g==
+eslint@9.18.0:
+  version "9.18.0"
+  resolved "https://registry.yarnpkg.com/eslint/-/eslint-9.18.0.tgz#c95b24de1183e865de19f607fda6518b54827850"
+  integrity sha512-+waTfRWQlSbpt3KWE+CjrPPYnbq9kfZIYUqapc0uBXyjTp8aYXZDsUH16m39Ryq3NjAVP4tjuF7KaukeqoCoaA==
   dependencies:
     "@eslint-community/eslint-utils" "^4.2.0"
     "@eslint-community/regexpp" "^4.12.1"
-    "@eslint/config-array" "^0.18.0"
-    "@eslint/core" "^0.7.0"
-    "@eslint/eslintrc" "^3.1.0"
-    "@eslint/js" "9.14.0"
-    "@eslint/plugin-kit" "^0.2.0"
+    "@eslint/config-array" "^0.19.0"
+    "@eslint/core" "^0.10.0"
+    "@eslint/eslintrc" "^3.2.0"
+    "@eslint/js" "9.18.0"
+    "@eslint/plugin-kit" "^0.2.5"
     "@humanfs/node" "^0.16.6"
     "@humanwhocodes/module-importer" "^1.0.1"
-    "@humanwhocodes/retry" "^0.4.0"
+    "@humanwhocodes/retry" "^0.4.1"
     "@types/estree" "^1.0.6"
     "@types/json-schema" "^7.0.15"
     ajv "^6.12.4"
     chalk "^4.0.0"
-    cross-spawn "^7.0.2"
+    cross-spawn "^7.0.6"
     debug "^4.3.2"
     escape-string-regexp "^4.0.0"
     eslint-scope "^8.2.0"
@@ -3279,7 +3284,6 @@ eslint@9.14.0:
     minimatch "^3.1.2"
     natural-compare "^1.4.0"
     optionator "^0.9.3"
-    text-table "^0.2.0"
 
 espree@^10.0.1, espree@^10.3.0:
   version "10.3.0"
@@ -4161,12 +4165,7 @@ ignore-by-default@^1.0.1:
   resolved "https://registry.npmjs.org/ignore-by-default/-/ignore-by-default-1.0.1.tgz"
   integrity sha512-Ius2VYcGNk7T90CppJqcIkS5ooHUZyIQK+ClZfMfMNFEF9VSE73Fq+906u/CWu92x4gzZMWOwfFYckPObzdEbA==
 
-ignore@^5.2.0:
-  version "5.3.0"
-  resolved "https://registry.npmjs.org/ignore/-/ignore-5.3.0.tgz"
-  integrity sha512-g7dmpshy+gD7mh88OC9NwSGTKoc3kyLAZQRU1mt53Aw/vnvfXnbC+F/7F7QoYVKbV+KNvJx8wArewKy1vXMtlg==
-
-ignore@^5.2.4:
+ignore@^5.2.0, ignore@^5.2.4:
   version "5.3.1"
   resolved "https://registry.yarnpkg.com/ignore/-/ignore-5.3.1.tgz#5073e554cd42c5b33b394375f538b8593e34d4ef"
   integrity sha512-5Fytz/IraMjqpwfd34ke28PTVMjZjJG2MPn5t7OE4eUCUNf8BAa7b5WUS9/Qvr6mwOQS7Mk6vdsMno5he+T8Xw==
@@ -6398,7 +6397,14 @@ string_decoder@^1.3.0:
   dependencies:
     safe-buffer "~5.2.0"
 
-"strip-ansi-cjs@npm:strip-ansi@^6.0.1", strip-ansi@6.0.1, strip-ansi@^6.0.0, strip-ansi@^6.0.1, strip-ansi@^7.0.1, strip-ansi@^7.1.0:
+"strip-ansi-cjs@npm:strip-ansi@^6.0.1":
+  version "6.0.1"
+  resolved "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz"
+  integrity sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==
+  dependencies:
+    ansi-regex "^5.0.1"
+
+strip-ansi@6.0.1, strip-ansi@^6.0.0, strip-ansi@^6.0.1, strip-ansi@^7.0.1, strip-ansi@^7.1.0:
   version "6.0.1"
   resolved "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz"
   integrity sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==
@@ -6473,11 +6479,6 @@ test-exclude@^6.0.0:
     glob "^7.1.4"
     minimatch "^3.0.4"
 
-text-table@^0.2.0:
-  version "0.2.0"
-  resolved "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz"
-  integrity sha512-N+8UisAXDGk8PFXP4HAzVR9nbfmVJ3zYLAWiTIoqC5v5isinhr+r5uaO8+7r3BMfuNIufIsA7RdpVgacC2cSpw==
-
 thenify-all@^1.0.0:
   version "1.6.0"
   resolved "https://registry.npmjs.org/thenify-all/-/thenify-all-1.6.0.tgz"
@@ -6870,7 +6871,16 @@ workerpool@^6.5.1:
   resolved "https://registry.yarnpkg.com/workerpool/-/workerpool-6.5.1.tgz#060f73b39d0caf97c6db64da004cd01b4c099544"
   integrity sha512-Fs4dNYcsdpYSAfVxhnl1L5zTksjvOJxtC5hzMNl+1t9B8hTJTdKDyZ5ju7ztgPy+ft9tBFXoOlDNiOT9WUXZlA==
 
-"wrap-ansi-cjs@npm:wrap-ansi@^7.0.0", wrap-ansi@^6.2.0, wrap-ansi@^7.0.0, wrap-ansi@^8.1.0, wrap-ansi@^9.0.0:
+"wrap-ansi-cjs@npm:wrap-ansi@^7.0.0":
+  version "7.0.0"
+  resolved "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz"
+  integrity sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==
+  dependencies:
+    ansi-styles "^4.0.0"
+    string-width "^4.1.0"
+    strip-ansi "^6.0.0"
+
+wrap-ansi@^6.2.0, wrap-ansi@^7.0.0, wrap-ansi@^8.1.0, wrap-ansi@^9.0.0:
   version "7.0.0"
   resolved "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz"
   integrity sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==