Thanks for your reply, custardpsc.
So I can leave and re-enter the US on my UK passport on the VWP (Visa Waiver Program)? Is the I-20 still required? SEVIS?
Yes, I hold a stand alone FAA PPL. My attendance at the school will be to finish the minimum hours required and at the same time, fine tuning the manuevers, with the CFI, in preparation for the Check Ride.
What constitutes "finished studying"? I have taken the FAA Commerical written exam already. The only studying I would be doing is "home study" in preparation for the Check Ride. I'm sure that the CFI will have a "ground" session too before signing me off for the Check Ride.