Reservations, yes. On July 14th 1940 a meeting was held to discuss the integration of "foreign" pilots into Fighter Command. Dowding expressed strong reservations about "the infiltration of foreign pilots into British squadrons." He was concerned about morale and was not convinced that these pilots would have the "proper fighting spirit." Foreign in this context means Czechs and Poles as he had no problem with French, Belgian, Dutch, American or Norwegian pilots.
Whatever Dowding's reasons for this opinion it is only fair to say that he renounced it later. By August he was telling Churchill that the Czechs and Poles were "magnificent fighters."
Fighter Command was in desperate need of qualified combat pilots by September 1940. In the second week of September Fighter Command squadrons averaged only 10 operational pilots out of an establishment of 26. the crucial 11 Group was above average with 19. This dire shortage led to Dowding introducing the much disliked "stabilisation system", feeding squadrons at the sharp end with individual pilots as opposed to rotating squadrons in an out of 10, 11 and 12 Groups. He also established the "C" squadrons which were almost non-operational units. In October 1940 there were 440 non operational pilots at such squadrons, nearly 1/3 of total pilot strength. This dire shortage of trained combat pilots is often overlooked, even in official histories.
The "Battle of Britain" pamphlet, published during the war by HMSO stated that "the fighter squadrons of the Royal Air Force were indeed stronger at the end of the battle than at the beginning."
Dowding replied that "whatever the paper return showed, the situation towards the end was extremely critical and most squadrons were fit only for operations against unescorted bombers."
It is a sad fact that under trained pilots thrown into the fray die. Peter Brothers makes the telling observation that "of the 20 pilots in the pre-war 32 squadron, not one was killed." Training and experience kept them alive. That is precisely what the Czechs and Poles had and Fighter Command needed them.
If they all started off on Hurricane squadrons it is probably simply because the majority of Fighter Command squadrons were equipped with the type.
Cheers
Steve