My Ford Fiesta recently got a flat tyre, and as the puncture was in the side wall, my uncle decided to put on the spare. However, he was unhappy with me driving the 80 miles back home on it on my own as he thought there was a problem with the wheel nuts. He said that he thought there was not enough contact between the nuts and the wheel. The original wheel is an alloy wheel and the spare was steel.

I drove about 1/4 mile to a spares shop, which turned out to be shut, but there appeared to be flecks of metal wearing off where there was contact from the wheel nuts. I was wondering if this was a common problem, or it was dangerous for me to drive home on it?