Not sure where abouts in the uk you are but if your near Wakefield (if not it's worth the drive!) I've found an excellent store it's won loads of awards, interfish it's called, now I've found it I won't go anywhere else! Massive selection of corals, fish and critters anything you need even choosing your own live rock pieces. Everything is so healthy and surprisingly cheaper than everywhere else.
Check it out on the web everyone from the UK.