I have just received this from blog.co.uk. A rapid response.

thank you for your request.

I deleted this user again. Apologies for the inconvenience, however there is not much I can do apart from continuing to delete this user every time he/she signs up.

Kind regards

blog.co.uk Customer Support

This time the profile has gone. It obviously didn't work yesterday. I thought it was a bit strange that a deleted Member still had a Profile.