The serial numbers for this contract are 4854180 - 4857179 (=3000 machines with numbers allocated in order of frame numbers)
The frame numbers are TL50418-50431 and TL50439-53417, so 7 machines missing? Allocated elsewhere?
Yours is the 2696 bike in the sequence. I make that C4856875.
PS. Strangely Mine is from the previous contract which were delivered earlier but had higher serial numbers, in fact most of the previous contracts had higher numbers, which is because the demand for your contract was originally dated Oct 1940, which must have been for 3SW. But the bombing of Coventry in 1940 disrupted everything! Ron