I'd imagine there was numerous amounts been sold with the owners been banned from speeding.
Speeding was more socially accepted then along with other motoring offences. It's not often nowadays you hear of people been slapped on the wrist and told to behave, unlike now where everything is geared up to give you a financial loss in one form or another.
Parts were expensive for these and for the people then that couldn't afford to replace x,y & z part, there was always some scrote who'd offer you a whole complete, freshly nicked one for a couple of hundred £'s.
My best mate was really big into doing rally/performance cars and had quite a few them at any one time. He used to deal with insurance companies taking there write offs and stolen recovered ones from them. I done the 4x4 stuff as in Land cruisers/Patrols for overseas competitions in the same yard. I was 18 or so when I had my first one and they were called whale tails then.
Cossy's really could be maggot magnets and the money we spent keeping these vermin away was untold but they still use to try.