Not mentioned a lot but IMHO "the" worst mistake the British made in WWII. Had we focused on pressing on and finishing off the Italians in North Africa, the Italian situation to those looking in from the outside would have looked impossible to save. A real possibility the the Afrika Corps deployment in North Africa would have been aborted by Hitler before it began? If not the much stronger British forces might well have halted Rommel's intial push in early 1941 and altered the war in the desert. Imagine this scenario ! June 1941. British & Empire forces in North Africa, Victorious, confident, experienced, battle hardened (yes against the Italians but Italian bullets kill as well) with no one to fight. 6 months before Pearl Harbour and already halfway to Singapore!