If you're not logged in, ticket invitation email takes you to https://hq.pyconuk.org/accounts/login/, with message "You need to create an account to claim your invitation".
To create an account you need to spot that there's a "sign up" link in the top right corner.
When you sign up, you're taken to the index page, and you've got to click on the link in your email again to claim your ticket.
If you're not logged in, ticket invitation email takes you to https://hq.pyconuk.org/accounts/login/, with message "You need to create an account to claim your invitation".
To create an account you need to spot that there's a "sign up" link in the top right corner.
When you sign up, you're taken to the index page, and you've got to click on the link in your email again to claim your ticket.