This quote is sometimes attributed to H.G. Wells, and is found in Wells' short story, The Country of the Blind.
Masen, a very well read biologist, claims that the quote originates with a Roman gentleman by the name of Fullonius, who wrote Caecorum in patria luscus rex imperat omnis. Highbeam research claim that it is actually 'in regione caecorum rex est luscus' (Erasmus Adages is given as the source). My Latin is not good enough to decide which sounds better.
Hitler's war is, of course, World War 2 (1939 - 1945).
'The Blitz', the sustained aerial bombing of Britain by Nazi Germany, occurred between September 1940 and May 1941. At its worst, London was bombed for seventy six consecutive nights. To see a digitised image of St Paul's during fires unleashed by Blitzkreig bombing visit this page.
It is located in Malet Street in Bloomsbury.