I thought this trhread had gone dead ages ago!
Great additional background info.
My Lola is progressing quickly as a full hillclimb car now just to continue the colourful life it has led.
I have no further progress to its life pre 82 ish, but the rear chassis and tub has all manner of welds and holes and mods to it to show for the last years. The tub was modified with additional alloy sheet all foam filled for rigidity.
The car now has a 3200cc Porsche flat six and box sitting in the rear.
The original Lola gearshif mates perfectly, even the March F2/Atlantic fits and the driveshafts mate to the Porsche box after a little surprise or two...
I have located March uprights with caliper mounts and so the conversion goes on.
I am no closer to a chassis number however, and have given-up the chase.
