Al,
I have yet to stuff and solder the board. Once the transformer has done it's work and converted mains AC to 750VAC (375-0-375), I guess that there is absolutely no difference between the SimpleSE here in the US or in the UK. Although check the Region Code on any DVDs you'll be running through the SimpleSE ! SORRY only kidding.
The SimpleSE will be my first tube amp. I have built a SS power amp from a kit, and have built an Aikido tubed preamp using Broskie's board. The SimpleSE will be run with CD / iPod input straight into speakers. I couldn't source the 80uF ASC motor-run cap, but have a couple of 45uF GE motor-runs, which I'll parallel.
My advise is to work on the SimpleSE in as methodical a manner as possible and don't try to rush it. Also, if mounting components of different sides of the board, be sure to check polarity where it is important like caps and the solid-sate components.
So how is the weather other there in Blighty? My folks live in Rochdale (nr Manchester) and have been complaining bitterly about the inclement weather of the recent weeks. I assume that you have survived the flooding.
Charlie