Ian,
I have found I do have a couple of French 165×400 rims left over from my 4-cylinder days.
I am located in Wellingborough, Northants – not exactly on your doorstep but a bit nearer than Bryn whom I suggested earlier.
Let me know if you are still looking and I shall take some pictures for you.
I also have a number of part worn tyres which will be well past their “best by” date as far as road use is concerned but ideal for a car in store when lack of regular driving can result in a set in the tyres.
B…..