Well a better tank by D Day
More lift capacity
More precision fighter bombers
of course a tank and a lanc arnt the same but we had emphasis in the wrong places at times
I think the question was on why were sausages rationed!
At times maybe so. It is possible to argue with hindsight, but by 1944 we were dependent on the Americans for tanks, lift capacity, though not fighter bombers. Fighter bombers were plentiful, there were reasons having nothing to do with production capacity why they were not specialised ground attack aircraft.
The British weren't planning an invasion in 1940, 1941, 1942, and barely 1943. They were carrying out a strategic bombing campaign for which they needed strategic bombers, all those Lancasters and Halifaxes.
They were doing it on their own for a long period. The US 8th AF joined in, but when was its first raid on Germany? Early 1943 IIRC and then not in great strength. The Americans certainly made up for it later and won the decisive battle against the Luftwaffe. This, arguably, was the only decisive result to come from the entire campaign and the Americans deserve great credit for it.
Cheers
Steve