Battle of Britain won date

[Shikhov]

Thank you Sirs!
It seems to me according to Graham Boak' info Oct.31 1940 became BoB Victory date in March 1941. But I've read that October 25, 1940 British Government was informed about one Ultra interception re one vital Luftwaffe Transport Command disbanded that means Invasion halted. War Cabinet and Churchill as Cabinet Chairman discuss matter October 31 and concluded that Invasion at least in 1940 not happen. Soon Army rediness declined. But Churchill was advised about mentioned Ultra interception in Sept.17 evening and soon photoreconing admit the fact. But information for public still closed in September and October. And seems later ?!
In my opinion Government could be affraid another "victory" like Sept.15 when London was bombed during whole day after or if Victory claimed.
In September population losses increased in 8 times and still the same level in October. May be this is reason instead Invasion possibilities and airsuperiority ?

[Graham Boak]

It was certainly highly undesirable to display evidence of having broken the German codes, so if the Sep.17th incident did mark a key event then keeping it quiet for a while was a very good idea, until evidence obtained from more open means could be obtained. (Of course, it helps if you know where to look.)

By informing the British Government do you mean the Cabinet or the House of Commons?

The March date is the first reference I've found to a public statement: more may be available in earlier Hansards.

[Shikhov]

Information returns from Len Deighton' "Battle of Britain." 1980-edition:
"31.10.40 Defence Commitee chaired by PM Churchill agreed that danger of invasion..."
This is absolutely clear matter, but seems for most peoples Battle of Britain continued within next several month.

[FalkeEins]

..a number of French and German writers have stated in recent publications that (1) there was no 'battle' in the accepted sense of the term, merely a series of skirmishes designed ultimately to maintain pressure on Churchill and force a political settlement, (2) that Ultra played the key role in the management of British defences that is usually attributed to radar, and (3) that no serious planning was ever undertaken for an invasion - the Kriegsmarine especially given no objectives - and that there was thus no victory to speak of...

[Franek Grabowski]

And in general it is outright ridiculous, as Germans never achieved their goals, and did not put the Albion on its knee, be it invasion was planned or not. Whatever the losses, RAF, RCAF and PAF achieved this.

[PeterVerney]

As an 8 year old at the time and living about 3 miles from Hawkinge aerodrome, I still have vivid memories of the period.
To us it was a life or death struggle with the hated Germans. (We were brought up on the saying "The only good German is a dead one")
We were also warned that the Germans were going to invade us and that when they came we were not to leave the village. Experience in France and Belgium had shown that masses of civilian refugees hampered troop movements. In fact I remember being told "When the germans come you boys are to put sugar in their petrol tanks". Suicidal I guess.
We were not aware of victory at all, the numbers of aircraft we saw shot down were roughly equal, we just knew the Germans gave up and their attacks became sporadic.