I've put this under travel because I think it is really 'camping'. I'm not sure if this is available online.
I recently bought a set of two mess tins from my local store which were half price - i.e: £2.50. This is a bargain! If you go to an army surplus store or similar, they are in the region of between £5.00 - £8.00 or sometimes above.
The wilkinson ones may be lighter than the proper army ones, but I think that is a good thing, if you consider that you might be carrying, in a bergen, everything you need to survive outdoors. I have put the dates as such, because I don't know when they will rung out of stock! (If that's what the dates mean!)