One of the places that we visited on our holiday travels was the Haynes Motor Museum in Yeovil. If you like cars you'll love it there. They had some wonderful vehicles and a Mini that had been cut in half (as opposed to the one I used own, which fell in half all by itself).
You could see all the inner workings of the Mini and I think I rather bored number one son as I went around the exhibit identifying each of the components that I'd had to replace on mine.
If you are in the area you really should go and look around. They do go-karting too.