If we're talking full size pulling Jon, then yes...there are several UK organisations spread around the country, and loads of forums and websites. There used to be a chap who owned a garage near Heathfield, right out in the sticks, he had a Merlin powered tractor (in fact, that was the first puller I ever saw) The tractor was still around up until a few years ago, I used to see it parked up in a shed when I was working up that way. There are several shows in Sussex where you can go and see tractor pulling, one just up the road from me...might even take mine along when it's done.
R/c model pulling is a different kettle of fish...Europe has several rc clubs, forums and websites all devoted to pulling competitions, but here in the UK, I seem to be the only one who has any interest in building a tractor.
My tractor will really only get used for demonstrations at model shows, so I'm not overly bothered about entering pulling competitions with it...it's just something I've wanted to build for a long time, but never got round to doing so until now.
Rich