In reply to Ed Blandford:
From memory, discounts are as follows:
Join the BCU - they get 15% off at Cotswolds, occasionally 20% on promotional weekends.
If you're young enough and get on a World Challenge expedition, they get 20% off - otherwise, leaders get up to 25% off.
Armed Forces get 20%, I think, if your unit has an account - 10-15% otherwise.