According to my files the only Polish pilot with roughly maching name and a Mosquito score was Sgt Kazimierz Leszkiewicz (780887) who destroyed a Ju88 on the ground at Husum on 25 April 1945.

As regards the Polish Mosquitoes at Exeter question, here is No. 307 Sqn Mosquito NF.II HJ932 EW-L photographed (in fact filmed) in colour at Exeter on 28 March 1943. F/Lt Jerzy Damsz (left) had just brough F/Lt Hugo Hrbacek (right) to base. Hrbacek, a Czech Spitfire pilot was downed into the Channel that day. When he was picked up, Damsz flew in his Mosquito to Tangmere and brought him back to Exeter.