Sorry if this has been started elsewhere.
Please list over here any prep related sales that you come across. It would be much clearer to have it in one place.
http://www.fieldandtrek.com/ - they have sales quite often, at the moment it's up to 50% off and free delivery. They are good for camping equipment, bought from them before and very satisfied.
http://www.gooutdoors.co.uk/ - xmas sale online is already on and in store starts boxing day. Again, camping equipment and clothes.