This service puts small files (known as ‘cookies’) onto your computer, phone or tablet to collect information about how you use the service.

Essential cookies

Essential cookies keep your information secure while you use this service. We do not need to ask permission to use them.

Name Purpose Expires
system_sessionId Browser session identifier When you close your browser
verification_token Token to prevent cross site request forgery attacks When you close your browser
session_information Keeps an encrypted record of the answers you've submitted When you close your browser
viewed_cookie_message Saves that you've seen and hidden the cookie message 6 months