Well outside my area, you need someone reasonably local for custom install, try www.dragon-av.co.uk, based in Cardiff I believe. But I'll wave at your house on Saturday, my in laws are in Camarthen, big family party this w/e
If it,s not too late, try this company http://www.controlwiseci.co.uk.
I'm dealing with them at the moment and they seem excellent. They are family run business, with a local demo suite which I'm vising next week. I'll let you know how I get on.