The fact that the flag has "Poland" and an instruction arrow showing which way the flag was flown might point to it being made in the UK and used by the British in official ceremonies rather than being used by Poles who would of course know it was the Polish flag and which way up it should be flown.
Maybe this flag was used for the "Victory" parade, for although no Poles actually attended the parade, the British government had invited the Warsaw communist government so was expecting a contingent to arrive for the parade in London. The official victrory parade leaflet also had a reference to a Polish Military Band in the programme but I have not seen confirmation that there was one actually playing during the celebrations.
By 1945 the Polish government in exile was derecognised so would probably not politically have been able to fly the Polish state colour in London as it no longer represented Poland in the UK.
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