I like the Ideal Milk tin with the British Army overprint. I have a Nestlés (pronounced Nessels not this posh new fangled nonsense Nest-Lay.....)tin with the overprint Suppliers to HM Forces.
Re the tea sugar tin, I'm not convinced that they are anything other than civilian workmens items. They are often said to be military but I have never seen anything to support this. My Dad used one in the 1950/60s when he was working as an engine driver for British Railways. I still have it. He tells me he bought it new in the 1950s so I would guess these tins have been around for a long time. They always struck me as being too small for a military issue.
I'd agree - never found anything concrete on the Tea & sugar tins either, just circumstantial. The one with your ration - Just a 'commercial' tin too then?