The weapon of choice for many scandinavian craftsmen, carpenters and outdoorsy kind of people is the "Biltema" bow saw, which can be had for 9£
in a test it got 4 out of 5 points. The test was carried out by craftsmen in Sweden. I do not think you have Biltema in the UK but you do have Clas Ohlson....and they sell the winner of the test, the G-man bow saw for £8.99
Here is the swedish test. You can see the tables and what saws they where up against:
http://www.biltema.no/Documents/prod...63_14-2012.pdf
Anyway these saws are regularily praised on scandi outdoors forums as the one to get. It's the Mora of bow saws.
I am in no way associated with Biltema or Clas Ohlson, I just like cheap stuff that works.
And a good bowMsaw is handy for processing lots of wood for a night out...well, if you're car camping and you are not Martin.