I havee been living in UK for the lats 5 years and some of the names that I have found common are Aaric, Caddarik. Actually I wanted to have a list of common British names for one of my project and I was searching for it. Here, I got British names which are very common. Sorry, writing all these names would be a tough job, so I am sharing the link. Its
http://www.babynology.com/british_babynames.html.