Are there any gyms in the UK or maybe in Europe that have a reputation for being super hard?

I've wanted to go to Japan to visit B pump ogikubo, known as the hardest gym in the world, for a while now but I don't think I'm going to have money for a Japan trip any time soon. Maybe there's something that will satisfy my strange craving of wanting to fall off v2s somewhere more affordable.

It's not just about doing hard problems, I know I could just try higher grades in my local gym, maybe it's just a humbling experience that I'm looking for? I don't know.