Halloween doesn't have a long tradition in the UK the same way that it does in the US. I have very few memories of Halloween as a child... a costume party here and there (mostly my memories are of bobbing for apples) certainly we never went trick or treating. I'm not sure that we'd have got very far in semi-rural Kent knocking on our neighbours doors, I'm pretty certain they'd have been straight on to our parents to find out what we were up to.
However, childhood traditions aside I always do get a pumpkin to carve. I've never managed to work out any recipes for the flesh but I do like to roast and eat the pips. Best hot and straight out of the oven.