Witold "morela" Dąbkowski, Polish VI (Sixth) Bureau Instructor
Dąbkowski, Witold 25.11.1915 - 06.04.2002 buried in England.
The VI Bureau was created to carry out secret liason with Nazi-occupied Poland and was the chief 'carrier' of encoded intelligence reports for the II Bureau (intelligence).
I would suggest you contact SPP-PUMST in London who will have records for Witold Dąbkowski.
Are you related? If you are you will also be able to obtain his service records from British MoD.
There are links to SPP-PUMST and MoD elsewhere on the forum.