Two answers.
One for Swooshdave: believe it or not, Andover Norton's sheet metal parts are indeed made by dapper old craftsmen in England. But for two exceptions- steel petrol tanks, and the mudguards, which are made in the EU but not in England. And as far as I know the mudguards (fenders to the colonials!) weren't made in England in production times, either.
Now Hermann the German: In about 1985 we had a discussion in Shenstone (then the Norton factory) about re-making Commando Roadster petrol tanks. The press tools still existed- they since got lost- but the cost at the time for a raw tank was, at today's exchange rate, then 715,- US$ to the factory. This was raw cost, unpainted. Add to that a dealer margin and a margin for the factory, and it was simply not viable- not even at the raw cost figure. A secondhand Commando was about 4-6times that cost figure at the time. The project was shelved, never to be discussed again.
Today the tooling is lost. Even if it existed I doubt the exercise was any more viable. The Indian tanks I have bought- and my son Tim actually rides one on his Commando- are sort of o.k.. The shape is not quite what it was, they are not strictly speaking symetrical, and some of them leak from new, but given one checks them BEFORE painting they are normally useable. And certainly better than a gradually dissolving fibreglass tank.