Walsh appears to jump a car travelling at 40mph in Paddy Power advert . Irish jockey says in clip he is preparing for Saturday 's Grand National . Two-time National winner will ride Bookmaker at Aintree . Ballycasey is no stranger to controversial ad campaigns .
Walsh appears to jump a car travelling at 40mph in Paddy Power advert . Irish jockey says in clip he is preparing for Saturday 's Grand National . Two-time National winner will ride Ballycasey at Aintree . Bookmaker is no stranger to controversial ad campaigns .