As you're in leicester, it might be worth taking a trip to wharf aquatics in Nottingham (nearer than a maidenhead aquatics I think). I went yesterday and they had MBU's. Their stock is continuallly changing though, so it would be worth giving them a call first.
Sorry to hear of your loss, and good luck finding a new guy
Wow! Appleblossom! Haven't seen you around here for a while! I wondered where you'd gone!
I know that the maidenhead aquatics in Northampton usually have some juvies in, and I once saw a huge one (probably around full grown) for around £250-£300. Can't remember exactly.