Then you could argue that it begun much earlier if a lone recon plane crossed the channel. No?

or.

The Luftwaffe attacks the British Fleets anchorage at Scapa Flow in the Orkney Islands. This raid causes the death of a British civilian, the first of the war which was on the 16/3/1940

More than 100 German bombers make raids over Britain, 19/06/1940

so does this mean according to you that this is when the BoB started?

World War 2 Timelines 1939-1945 - European Air War 1940 - Worldwar-2.net

__________________
They shall grow not old as we that are left grow old Age shall not weary them, nor the years condemn
At the going down of the sun and in the morning
We shall remember them. Lest We Forget