Easy peasy.
If the bike sells, post up on ebay saying,"Sorry folks. I rode the bike into town today to gas it up and put air in the tires, and somebody's grandmother in a Lincoln Towncar ran me off the road. I'm just a little bruised thanks to wearing full armor. But the bike's got a bent frame, bent forks, and the crankcase on the motor is split wide open. I'm canceling the auction. Sorry.
Of course everyone would wonder what the hell is a Lincoln Towncar doing in Aldermaston