I have just today been sent a copy of the dispatch records from the factory of the HEC Powerbike, it's in a dropbox file (whatever that is) just about manged to download it on the phone but unable to open on the PC.
Nice to see my bike Frame Number 7XX still has it's original engine 6XX fitted.
Dispatched to Kings of Birmingham 5/4/40. shame there is no reg number, wonder if Kings records are out there somewhere?
It's had a new latching clutch lever, cables tidied, and NOS John Bull pedals fitted since this picture.
From the page I use to check for reg numbers FOC = APR 1939 -> and lasted till FEB 1946 (there was a war on)
How come 758 was on this bike May 39 ?
Because it's not true. FOC ran from April 1939 to May 1939. Birmingham was getting through over 1,000 registrations a month before war broke out. So FOC was followed by FOE (May 1939), FOF (June 1939), FOG (June/July 1939), FOH (July/Aug 1939), FOJ (Aug to Nov 1939), FOK (Nov 1939 to April 1940), FOL (Apr to Jul 1940), FOM (Jul 1940 to Jul 1941), FON (Aug 1941 to July 1945). You can see how registrations slowed down during the war - but it wasn't quite as dramatic as it looks: during the life of the FON series, Birmingham also worked through FOX, FOV, and FOP (in that order), which were issued to goods vehicles only.
I think your source has assumed that FOC was used until GOC started: that was Feb 1946.
They didn't hang about gettimg this bike down to London for testing and getting to print !
Dispatched from the factory 12 May 1939, logged as the "Birmingham Demonstrator" it was in THE Motor Cycle 25th (That's assuming it's the same one?) It has a Birmingham reg, all the others went to dealers exept one.
The exeption was Frame 153 which had a "special carrier" and went to Queen Charlotte's Hospital and then permanent loan ?