Ah yes I have looked up the source on Google books Hmmm Seems that the author either made a mistake or perhaps is erroneously referring to the Poles and Czechoslovakians together as the Polish contingent alternatively it could be that he made reference to a PolishCzech contingent or something similar and a prose editor changed it I would usually say leave it as it is when you have a sourcing anomaly like this but in this case we are dealing with numbers of people and it can clearly be seen that as worded this just isnt right I have reworded to Belgium provided the largest contingent of pilots during the Battle of Britain that did not come from Eastern Europe or the Commonwealth Do you think this is okay I think there is never going to have a stable set of figures for this partly because it is often hard to pigeonhole people as being specifically from one country Take for example Squadron Leader Caesar Hullborn in Rhodesia schooled in South Africa joined the UK in Britain Sources variously list him as either Rhodesian or South African in his article I went with Southern Rhodesianborn Theres a Battle of Britain pilot who was born in South Africa and a British citizen but who is counted in this article as American as his parents came from there Then you have that pilot who was basically British but who was born in Haifa and so occasionally shows up in lists as Palestinian or Israeli for example at the end of the Battle of Britain film with Michael Caine I think the approach we have at the moment is actually bestthe figures dont line up exactly but giving a couple estimates for each country gives a general idea of the contingents size