“The King called for a National Day of Prayer to take place on 8th September…”
From Beyond the Odds by John Scriven and Tim Dieppe:
The King called for a National Day of Prayer to take place on 8th September [1940], to mark the anniversary of the outbreak of war. A service was held in Westminster Abbey, at which the final prayer began: “Remember, O God, for good, these watchmen who by day and by night climb into the air. Let thy hand lead them, we beseech thee, and thy right hand hold them.” This prayer was answered, and also from that day the weather in the Channel deteriorated, further holding back the German invasion plans.