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@jj72
That’s pretty standard. You’ve been riding it with the crank bolt loose, and it’s flapped about and enlarged the hole. They’re easily replaced tho. Yours is a diamond hole, you’ll just need to check the crank length; it’ll be stamped on the inside just around the pedal hole. It’ll probably be 170 or 175mm. Think they retail at about £12-15, and most LBS’s should have an old one knocking about if you’re skint.
The bottom bracket axle will be fine. It’s steel, and the crank is aluminium and the crank will give first.