Did you checked at Bass Centre?
I've heard they have the Steinbergers.
There are some EUB makers in UK.
Some links:
http://www.bridgeinstruments.com...Mo Clifton: mo@cliftonbass.freeserve.co.uk
http://kif.co.uk/Basses/basses.h...oakwood@magpie.demon.co.uk
http://www.artservicesireland.co...http://www.starfish.f9.co.uk/Hope this helps.
Did you looked at used instruments?