Just received this from Which Bingo newsletter.

They have an exclusive offer which gives £15 free at FoxyBingo... no deposit is apparently required (so I assume it's just in your account after you've signed up).

whichbingo.co.uk/free-15-and-foxy-bingo-beanie/index.html (I can't post clickable links it says... perhaps a moderator can update this?).

You need to use code free15 when signing up.

They also will send you a free foxy bingo beanie, though I have no idea if this is Which Bingo or Foxy themselves who send these.

Hope this is of some use.