Hi Bernie
The ring for bolting the Steering wheel to was just about the rustiest bit of the whole car and had suffered some serious hammer damage so I’m guessing it wasn’t the original. Thats probably how the first nut died.
I measured the steering column and it’s 20 mm so ordered a 20 / 1.5 nut from Accu on the internet for £1.29
hopefully that’ll work
Many Thanks
Alistair