You'll also need a route along the lines of:

    /user/id/:id

We have these in old Identity.

    https://id.theguardian.com/profile/adamfisher
    https://id.theguardian.com/profile/id/10157849

This is important because not all users have vanityUrls. In particular, IIRC social signin doesn't provide a vanityUrl and this accounts for an overwhelming majority of our active users. As it stands there's no way to access the profiles of such users via `profile.theguardian.com`.