Cheers for all the replies!
It's a shame, the tent would sit nicely strapped tight under the bottom of the kestrel but there's nothing to fix it on with and the sleeping bag/mat straps sit too high and too far out to secure it properly.
Any recommendations in the 45-55L range???
Alot of the other packs I've seen seem to jump up to 65L+ so might be going too far the other way... I have seen a zepton 50 on sale but the lack of stash space and top only acess are putting me off a bit.
In addition to the wildcamping I was hoping to do some lowland walking and camping soon such as the dales way, or anglesey coastal path then a more challenging LDP next year. I suppoose I don't want to shell out too much on something to make-do when I could spend a tad more and get something I'll be properly happy with 
Edited: 05/08/2012 at 15:48