Hello
SITKOWSKI Andrzej born 1899,there are some files at WBH in Kolekcja Wojskowej Komisji Archiwalnej.They will definitely have something at IPMS London.It's best to download the RECORD BOOK-ZESZYT EWIDENCYJNY, but I don't know if Ministry of Defense UK will make them available to bystanders.
Kwerendy i poświadczenia - Wojskowe Biuro Historyczne
Best wishes
Artur
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