AFLM, I always love when you UK'ers post your meals. Geez, for being similar, we sure eat different.

To the OP, I've had luck with the USCG lifeboat rations and the freeze dry food. I believe REI carries individual meal size, that are shrunk wrap. I've also had MRE's in my truck for 2-3 years and they're palatable. Not something I'd keep for long term if I was thinking on foot.