The FAA initial is pretty straight forward. Not sure about getting it done in the UK though. For me it was a straight case of making an appointment with an FAA AME, medical was about 30mins long. I'm dreading the thought of having to do a medical examination for 4 hrs.
Not to mention the 2-3 weeks wait as quoted by the folks at Gatwick. I just find it so difficult dealing with or getting information from the CAA.