What do you mean, out of interest?
I don't class Blackpool Pleasure Beach as a themepark. Even thought Alton and Blackpool are both amusement parks with rides, in terms of experience, I see them as completely different. It's like comparing our budgies to our cockatoo, they are all parrots, but not the same. You just can't compare them as I visit them both for completely different reasons. Seaside attractions have a different vibe to that of a themepark. A theme park is more immersive and takes you into a different world whereas a pleasure beach has that seaside resort collection of rides with the radio music playing in the background, it has a completely different atmosphere to it.