Just remembered one 'method' of winning. Years ago, before self-service, my family had the Hyperion garage in Newmarket. The travelling head lads used to fill up there. Seeing the old boy on the pump, and feeling generous, they'd tell him if anything in the yard was expected to run particularly well that day. He thus made a few bob for himself, now and again, on small bets. Unfortunately, he hit on a better method. Next time a good car came in, he'd sell the tip he had just got, to the grateful driver! Safer than risking his own money. Sadly, after a month or two, this Prince Monolulu of the 4 star got rumbled and his career, and the tips,on which it depended, came to an end