Hello Dan,
We've had a good couple of months recently, but March has been a bit dismal so far. We use the take off field at Powick (any direction) and drift off XC where ever we fancy, Jock, Mike and myself are fairly regular (at least once a month), but we all have our own local fields as a preference.
If you get cold free flying after an hour, you'll be cold on the motor after 10 minutes... Have you tried an Ozee millenium suit? I can motor around in mine for an hour without issues.
cheers,
Richard