What's the easiest way to make friends with people from the UK as someone from the USA?

I want to make some friends from the UK as I may be moving there within the next couple years and definitely will be visiting sooner than that. I just don't know how to go about it. I post on subreddits sometimes and I meet a few lovely people and a lot of very bitter and frankly hostile people as well. I just want some UK friends....I don't understand why its so hard!