I've tried to upload my photo, but after I've selected it and clicked 'upload' a message appears saying 'no longer possible'.

Am I doing something wrong, or has this feature been disabled?

The feature has been disabled. Where did you find a link that offered you that option please?

Not sure if this link will work or you'll need to be logged in as me to see it bookhippo.uk/editProfile.php?t...

It's under Settings / edit profile sections / profile picture