The 'Brits', at no time in WW2 'stood alone'. It was an Alliance from start to finish.. The UK would never have been able to tackle the German Army if it was 'alone'. I know of no rational person who asserts the contrary. Perhaps you can be the first to explain how it could be done successfully?
Curious as to why you've been dormant for 3 and a half years and now, you spring to life . . .