There were 4 Estonian pilots who served in RAF. They were Peeter Olt, Endel Susi, Ants Liblikmaa and Mihkel Kristiani.
All 4 were arrested by Soviets, and were in prison camps. As Soviet Union also started war with Germans they started to gather Polish soldiers and officers in prison camps to Anders army. As Estonian pilots had good relations with Polish - with some help from Poles they also pretended to be Polish and were included in Anders army, and left with it Soviet Union.
Peeter Olt was oldest of them, and didn't serve in any frontline unit. He was ferry pilot and survived the war. Died in Engalnd on 1970.
Endel Susi was flying on Mosquito fighters in one Polish regiment. Don't remember now exactly the number of it, but about him is mentioned in one Polish book, about what i got some information from one guy in Poland. He also survived the war, earned severeal British and Polish war medals, moved after war to Canada, and also died there somewhere in 1970'ies.
Ants Liblikmaa used in Polish squadron also another first name - Jan (as Ants have some other meening in English than in Estonian
He was killed in flying accident in some reserve unit where he was after his first battle tour also in one Polish squadron and also on Mosquitos. He is buried on Astwood cemetary near Worchester.
Mihkel Kristiani finished his advanced training to fly Mosquitos, but died before he started his battle tour because of some serious illness.
In RAF served also 2 Estonian women - Raja Tamm and Lea Lintrop-Hughes. Both were studying in England when war broke out. And they volunteered for military service. About Raja Tamm is known only that she served all the war in RAF, married some Englishman, and moved with him To South Africa after war.
Lea Lintrop-Hughes was killed in flight accident in 1944.
Thats briefly all what i found at the moment. Somewhere i might have also those units where did Susi and Liblikmaa serve...