but to be fair im going to have to have a look at all the uses for it 
the books i have at the moment are (probably common newb prep books)
ultimate SAS survival by john lofty wiseman
sas and elite forces guide "crisis survival by aleander stilwell
and finally the famous "food for free" by richard mabey.
What are the values of these 3??
I will definately have a look into the books you recommend, i mean as you say its better to get out even if it is with a book than nothing at all.
I must say im liking the friendliness of this place already
thanks guys for the help so far