If you want to go on a course first, try Land Rover Experience.
There are various centres, I`ve been to two (Solihull and Milton Keynes) and one was better than the other, both on terrain and instructor.
If you go on the websites of the various centres and can travel at short-ish notice look for the special offers - if they have two people booked but need a third for example there is usually a good discount.
They do a full day beginners and a full day advanced plus various other more specialist courses - all in tbeir cars so book the model nearest to yours (it will be a 110 s/w). I wouldn`t bother with the half-day course - if it comes free with the car great, but I wouldn`t pay for it, having said that see whats on offer.
Might be worth a trip to Billing this weekend if you fancied a vertical learning curve into the world of LandRovers, but maybe best not to venture onto the off-road course till you`ve had a bit more experience - if you are like me you will want to make your mistakes more privately first............................