Field and Trek are selling off ordnance survey maps at ?3.49 maybe worthwhile if you buy a few as postage will take care of any saving if you only buy one
http://www.fieldandtrek.com/product.asp?src=en080130-20nm&sessionID=OJM&pf_id=L000&sfile=1&name=ordnance%20survey&user_search=1&filter_cat=EQUIORDNMAPS
good price
Thanks for that information, I carry all the OS maps for the Munros in the boot of the car.