you will need to do the ground exams ,complete a minium 3 hrs with a faa instructor maybe more if you dont have a night rating ,and a check ride with a faa examiner , and some 9/11 security items all can be done in the uk
i know a few people that have done it one on a J/R
there is a examiner at coventry and a faa cfi in yorkshire pm if you want more details send a pm i dont want to advertise