No. 1586 (Polish) Flight Night April 3/4 1944

[Gregor30]

Michal, it is supposed to be Halifax LW284 "T" with the crew:

Pilot - F/O Jan Dziedzic,
II Pilot - F/Sgt Henryk Golebiowski,
F/E - Sgt Jozef Zubrzycki,
Nav. - F/O Antoni Blazewski,
Disp. - F/Sgt Stefan Kulach,
W.Op. - F/Sgt Jerzy Koper,
A.G. - F/O Stefan Czekalski

Take off was at 7.20 PM and return after 9 hours of flight.

This info is taken from the book by Kajetan Bieniecki "Polskie załogi nad Europą 1942-1945" (Polish aircrews over Europe) which is very detailed summary of special operations made by 1586 (Polish) S.D. Flight over occupied Europe (except Poland).
In addition to above mentioned sortie another 8 crews were sent to drop supplies to Poland that night. Those crews are enlisted in another book by Bieniecki as well.

I hope that it may be of help.
Gregory