Sorry to clutter up the board, but I didn't have an e-mail for David direct and somebody else might be interested in the info.
Mike Beckett, in Manchester, rang me this morning. He doesn't have an e-mail address of his own, but a message sent to his son Keith will get to him in a day or two;
Keith@beckettandsons.fsnet.co.uk
He confirmed he does have copies of pretty much all the Alexanders WC 42 production / assembly stuff, including a British manual with all the relevant numbers, and he would be very interested in making it available to you in exchange for any other info about this contract that you had.
As backup he gave me his phone number, 0161-773-1708
Gordon