WI: Germany conserves its forces after the Fall of France - Britain is left alone

[maltesefalcon]

If Germany did not launch an attack on Britain in the summer of 1940; it would give the UK time to rebuild their land forces

In what specific ways, backed by citations, did the Battle of Britain impede UK's ability to rebuild its land forces?

Point taken, but I was actually replying to a broader concept from the IP. There was at least an imagined threat of a land invasion in late summer 1940, for which the UK was outmatched as far as land forces capability.
If Hitler changed his mind a year later due to UK's refusal to seek terms, at least the British Army would have had that time to bind their wounds and rebuild.

[History Learner]

Stalin was already mobilizing and increasing industry as fast as it could be done.

The Soviet values in this table, especially in relation to Germany, say it all:

Yes, the Soviets went to full war economy before 1941 though, it just takes time to mobilize industry on that scale. Tooze kind of delves into that in The Wages of Destruction, in that what the Soviets were doing 1942-1944 was completely unsustainable and already in collapse by the latter year; it basically requires to take huge strategic gamble before ignoring whether you could get it done in time.

[TheMarcksPlan]

. Tooze kind of delves into that in The Wages of Destruction, in that what the Soviets were doing 1942-1944 was completely unsustainable and already in collapse by the latter year

Cite? I don't recall such a point in WoD but it's been a while.