Shortly thereafter a formal agreement between Poland and Britain was signed which clearly stated "If Germany attacks Poland His Majesty's Government in the United Kingdom will at once come to the help of Poland."
It very clearly did not state that at all. Check the text for yourself [avalon.law.yale.edu/wwii/blbk19.asp] . I must say that I expected better from Cambridge University Press.
The British responded with assurances that the Royal Air Force would attack industrial, civilian, and military targets.[10] General Sir Edmund Ironside then repeated this promise during an official visit to Warsaw in July.
Edmund Ironside was an army man and so knew very little about the capabilities of the RAF. Had anybody from the RAF been asked they would have replied that their bomber force was entirely unsuited to such a task. And then there's also the small matter of him being Governor of Gibraltar in July 1939....
The RAF did not even attempt to bomb German military installations
That's a flat out lie: there were repeated sorties (with considerable losses) against Wilhemshaven and other German military targets in the Elbe.
the Air Staff concluded on September 20: "Since the immutable aim of the Allies is the ultimate defeat of Germany, without which the fate of Poland is permanently sealed, it would obviously be militarily unsound and to the disadvantage of all, including Poland, to undertake at any given moment operations ... unlikely to achieve effective results, merely for the sake of maintaining a gesture." The Chiefs of Staff agreed, informing 10 Downing Street that "nothing we can do in the air in the Western Theatre would have any effect of relieving pressure on Poland."[20] And so the RAF decided instead to drop propaganda leaflets.
How many lies can this woman tell?! By September 20: a) the RAF had already been shown that its planes were a) no match for the Luftwafe; b) Britain had already lost on aircraft carrier and would have lost a second were it not for faulty German torpedoes; c) Poland was done for (because the Red Army had started pouring in to Poland; and d) leaflet dropping missions had already started.
I always love it when Poles criticise the RAF for not doing enough, they get so pissed off when asked "Perhaps the RAF should have followed the example of the Polish navy and run away days before the first shots were fired?"
The opportunity to fight a brief, localized war against Germany was therefore lost in September 1939.
As is traditional when speaking to Poles about September 1939, I will now ask precisely where the land war against Germany should have been launched by the British. Perhaps an amphibious assault on Hamburg?