My father was a Hurricane rigger/airframe fitter instructor at Halton in 1940 when the first batch of Polish groundcrew came through. He said they taught him about in-the-field servicing and repairs and could not wait to join an active squadron. It was no surprise to him when the Polish squadrons' serviceability became among the highest in the RAF.
A decade later at RAF Binbrook I remember many Service personnel still wearing their shoulder badges: POLAND, RHODESIA, CANADA, SOUTH AFRICA, AUSTRALIA, CZECHOSLOVAKIA. The Poles in particular used to spoil us kids at every opportunity. Much later I would realise why: many of them would not see their own families again.