Friday the 27th of September 1940
Day: Major efforts by massed Bf 110's and Bf 109's are aimed at London and Bristol in the morning . Only a few get through with heavy German losses.

The Tripartite Pact between Germany, Italy and Japan was signed.

Night: Raiders attack London, Merseyside and Midlands.

Losses: Luftwaffe 50: Fighter Command 23.

Weather: Fair in the extreme South. There was cloud and haze in the channel.