There is some information about him:
Kaczmarek Bolesław Jan
P-0536
RAF Service No.
28.01.1917
Gniezno
Gniezno
Poland
date of birth
place of birth
county
country
25.10.1951
Karaczi, Pakistan
date of death
location of grave
F/Lt
kapitan
Pilot
RAF rank
Polish rank
trade
306, 302 Sqdn
VM V kl., 4xKW, DFC
known or last posting
decorations
Source:
http://listakrzystka.pl/en/?p=108120