Galaxy, for the life of me i can't remember, it is a genuine question though because i remember Channel 4 asked the question in between races at the festival a couple of years ago. I will have to do some digging
Chinrullah won the Champion 'Chase in 1980 and ran in the Gold Cup the next day finishing a respectable 5th. I'm sure there are others who ran twice at the Festival. I remember Carrow boy winning on successive at Ayr in the '80's