nashy I've been trying to reply to your pm via this forums message system but it won't go for some reason. I've copied the reply below
(can you check your email address in your es control panel?)
Just joined es and noticed your from blighty. Do you know of any suppliers of kits that are easier to source from the uk?
I'm not aware of any UK sellers, but more importantly couldn't really tell you were is a reliable supplier. I got my parts in bits from lots of different sellers- from France, USA, Canada and HK/China so appreciate why you'd want a UK supplier- there can be a of of stress and time involved in doing it the way I did, but I had researched for ages and knew which parts I wanted.
The way to get the info you want is to join the UK forum pedelecs, the guys there are really helpful and are UK based too so are a mine of info about the UK side of ebikes. I used the forum during the learning process, endless sphere is for those who are after something a little 'more'- technically superb and very interesting machines but of a lot more power and exotic. I know several of the UK guys have built from kits and they'll be able to give good advice- eg if it is worth going the UK supplier route, or some other way (usually China/HK), which suppliers to avoid and so on.
I'd be interested in how you get on- if you post you're experiences please send a link.