How far are you looking to travel? what days will you be there? I know there's definitely indoor ski slopes with parks out some days(down in glasgow it's thursday and friday night) not sure if it's the same in all of them, never actually had a chance to go to the freestyle nights but they look pretty sweet.
There's definitely a decent indoor dryslope in england somewhere, can't remember the exact name of it, not very well advertised, but it's got an awesome park out it seems permanently.
Check out xscape, it's not the cheapest, think it might be 50$ for 4 hours or something, so IMO it's only really worth it regularly. Although on the plus side you can rent skis for free(make sure to call up in advance and find out, as I'm not sure it's definitely the case in england too)