I presume you've clocked this thread about British Online Dealers, most featured in it are quite good :
This one is my personal favourite, I ordered a new heater and a few bits a few weeks back now and it turned up literally the next day.
Good prices as well.
Blimey ... this forum's been a bit quiet!
Don't forget we're still in the teething stages with this UK part of the site, others will join up with time I'm sure. SomethingFishy will sign up I'm sure, once he returns to the site.