Interesting! Do you have some good sources on that? (not questioning that actually, just interesting how it went)
I beg to differ here: could bigger RN warships get through Suez Canal? But with it too, losing Gibraltar would have denied RN entry from the West of the Mediterranean. With Greece...
It's not: the same way Wehrmacht + Luftwaffe of 1939-1942 took Poland, Netherlands, Belgium, France, Yugoslavia (rather difficult terrain) and Greece (a few mountains are known to be there too).
Not even leaving just soil and sky by retreating Russians somehow stopped the Germans around Smolensk...
The British would likely have lost in North Africa and would have lost Suez Canal. No German invasion of Crete, Malta falls, Allied invasion of Italy would not have happened. No aerial bombing Ploesti oil fields from Italy. Yugoslavia and Greece still under Nazi control, entire Mediterranean sea...