OK... this is not an indorsement but
http://freespace.virgin.net/pete.hare/bonsai.html
is the web site of the East Midlands Bonsai Society.... I recognize a few of the names on the site... real good people and artists.
they seem to be from places like: ARNOLD BEESTON NEWARK Nottingham and others.... if this is by you get to them... if it is a distance perhaps contacting them will help you find some local help.