There are many thousands of us here on Wikitree researching families in the U.K. and other countries. In fact, the largest and oldest project on here is the European Aristocrats project, which has five sub-projects due to its size. One of the leaders is in Europe, one is in Australia, a couple are in Canada...
I'm an American but live in Canada. My ancestors immigrated to Canada and the U.S. from all over the U.K. (Ireland, Scotland, England and Wales) as well as Germany, Switzerland, Amsterdam, etc.
While the bulk of Wikitree members may be American, they have ancestors that immigrated from all over the world and, as such, do research 'across the pond'. You will find a wealth of information on the site, and the G2G forum is a great place to post genealogy questions to seek help in tracing your ancestors. I've found this to be a very generous community and think you'll love it!
And if you have any interest in getting involved in a project, we'd love to have you join us in the EuroAristo group. We're always looking for new members to help grow and improve our tree. You can read about it and find links to the sub-projects here:
http://www.wikitree.com/wiki/Project:European_Aristocrats
Darlene - Co-Leader, European Aristocrats Project