Roger,
I know the Arlon museum bought quite a number of vehicles from England. While we have a fair number of English members on this forum, I would also try asking at places like
www.hmvf.co.uk and/or place an ad in
http://www.cmvmag.co.uk/, MVT's Windscreen
http://www.mvt.org.uk/windscreen.htm etc.
Hope this helps,
Hanno