A bit complicated - big security formalities to get into airfield and this club has been known to charge you more than the usual fixed fee for a trial lesson. For example, if you book 1/2 hr and you get stuck on ground for 10 mins waiting for air traffic control to slot you in between RAF planes, the club secretary might charge you 40 mins! Would advise clarifying total charges before booking a trial flight. Good, competent instructors though.