I'm in the process of restoring a W/NG that I bought in a dilapidated state a year or two ago. I started restoring in March 2020 (along with most everyone else) and I've been working my way through the various parts and assemblies. I've now got to the back mudguard which was in a bit of a state, but recoverable with a fair bit of plating and brasing. The rear, lift up portion had what I took to be a previous patched repair but to my surprise and delight it turned out to be a brass plate with chassis contract number etc.. (see attached photo).
John Duckworth put me onto the Articles and Tech Info page on Drags website and the Known W/NG War Contracts Information table, but it left me a little confused. My frame number is XG13006 and engine number BH3976. Looking these up in the table, the relevant Demand and Contract Date is 18/9/40 D and 7/12/40 C, Contract Number C 8,722. As you can see from the photo the Chassis Contract No. is C 13871 which is a 14/3/42 D , 12/3/42 C in the table.