dont worry mate, all i did was stick every reciept in a plastic folder, they go from april to april then after my 1st year when i got a self assessment(which might as well of been in chinese) gave it all to an accountant with a diary of what id earned & he worked wonders. the more you worry the worse it seems-stick a tenner a week a way from now & youll be sound'
im in my 3rd year now & all correct with above system
also save £2 a week for your stamp