Hi Ian,
Have checked out the W/NG in the dispatch books. Here's whats in them-
Contract S4554 Tab(build number) 3351 Dunlop tyres price £63 13s 6d.
Dispatch date 18-7-44.
The engine and frame did leave together!
Check out B.F.M. page 20 for a pic of a bike from the same contract.
The I.W.M. also has a pic of the other side available.
Cheers, Mick.