Its only just occurred to me that we haven't posted the most simple working lunch yet, THE wrap.
Forget paying £4.95 per wrap from a chain cafe - here's where its at.
8 x wraps
1 x lime
1 x tin of tuna
1 x pack of feta
1 x jar of pesto
1 x pack of spinach
1 x bunch of coriander
BUT it makes at least 3 lunches and all you need to stock up on after that for the 4th is the tuna. So about £2 per lunch.
Also tasty as hell. Check it out