The old rogue used to like taking the kids out on nature walks to learn about birds and bees and stuff.
Once he chaperoned some students on a night foray looking for the Lesser Spotted Coddling Moth in one of Yorkshire's areas of outstanding nocturnal beauty.
Actually, it turned out to be a notorious Lovers Lane with dozens of courting couples in parked cars, about half a mile from the local council recycling dump.
'Jim, is that the sound of the Midnight Cricket?' one of his protoges asked.
'Uh, that's not crickets, kid,' Savile replied, 'that's the sound of zippers.'