£99 an hour at High Cross, just north of Ware (an hour's drive from Central London straight up the A10).
The field's unlicensed, so you have to fly down to Stapleford for a T&G at the beginning and end of each lesson, so in practice you get 50mins in your logbook, but an hour and twenty mins or so in the air. You pay for an hour (or part thereof).
The benefit is that you do a x/country every time you fly, but the downside is that you can't just hop in the a/c to go off and do your solo stuff, you have to fly dual down to Stapleford and drop your instructor off, and then pick him up again afterwards.
Seems to work well enough for me
