Here's a couple of highly recommended books for skill development and just plain fun. I've met many of the authors or attended their training, all below have excellent stuff. All are available at Amazon.
1) Back to Basics: A Complete Guide to Traditional Skills, Third Edition
2) Where There Is No Doctor by David Werner, Jane Maxwell and Carol Thuman
3) Where There Is No Dentist by Murray Dickson
4) Medicine for Mountaineering: And Other Wilderness Activitites by James A. Wilkerson
5) Harvard Medical School Family Health Guide by Harvard Medical School and Anthony L. Komaroff
6) Illustrated Encyclopedia of Healing Remedies by C. Norman Shealy
7) U.S. Air Force Search and Rescue Survival Training: AF Regulation 64-4 by Department of the Air Force and United States (Sep 2002) (used this in a previous life several years back when I went through some USAF E&E / Survival training - many good techniques)
8) The Farnam Method of Defensive Handgunning, Second Edition by John S. Farnam
9) The Farnam Method of Defensive Shotgun and Rifle Shooting by John S. Farnam (not sure how applicable these will be in the UK, but definately good material)
10) When Terror Comes to Main Street: A Citizens' Guide to Terror Awareness, Preparedness, and Prevention by Joseph A. Ruffini
11) On Combat, The Psychology and Physiology of Deadly Conflict in War and in Peace by Dave Grossman and Loren W. Christensen
12) On Killing: The Psychological Cost of Learning to Kill in War and Society by Dave Grossman (excellent books mandatory reading, in my opinion, if you are in the "Profession of Arms" or just interested in the topic)
and just for fun...
1) The American Boy's Handy Book: What to Do and How to Do It, Centennial Edition by Daniel Carter Beard and Noel Perrin
2) The prairie traveler: a hand-book for overland expeditions : with illustrations, and intineraries of the principal routes between the Mississippi and the Pacific, and a map by Randolph Barnes Marcy
(really enjoyed this one! It was interesting to see how folks 160 years ago covered over 2000 miles during the US westward expansion)
Enjoy.