Thanks thus far.......
.......and I agree, it's best that I keep well away if in doubt. By the way they are drums not diska - she's a 1980 model F50.
Yes, she is only used to move from the chalet to the beach which is less than 1 mile round trip however, I do give her a good blast each weekend, again only on the beach. I had her engine serviced only a couple of months ago and she starts first time every time. As a deisel she warms up quickly and runs very smooth withing 100 yards with no smoke. I'm pretty lucky really and all for £400 !
Anyway, I'll look at the wheels myself than call in assistance thereafter and report back - thanks again.
Buy it & Use it, then sell it and buy something bigger