Gliding does not stop for the winter! Have you heard of Wave or Ridge soaring; both are much easier to achieve when you have a tug to get you near the lift! Its really quite good fun trying to shear sheep with your wingtips!
At Talgarth I was informed that I'd need 65hrs PIC and gliding experience. I'd also like to do glider towing with a PPL, I already fly gliders and want to achieve a PPL sometime soon.
Regards; and Good luck!
Sky