WWW seems to have summed it up well, at least from my point of view as a student of many different UK/US civy/mil systems. I have been treated the same in all, paying or being paid to be there - do as your told, pitch up on time for the lesson and know what you need to know at that time and most instructors will work hard for you. If you feel you are not getting on with the instructor or the instruction is below par, talk to the CFI.
Best of luck!