For the record, I've found these two mentioned on vintage & historic sites:
Beaufort Restoration Services (UK) Limited
Bexon Lane, Bredgar, Nr. Sittingbourne, Kent, ME9 8HG, UK Tel: +44 (0) 1795 830288
Clifford Cox Engine Services, 21 Milford Road,Reading,RG1 8LG. 0118 9677799 (
www.rollingroadtune.co.uk)