I am looking for information about what happen to him in the war and the name of the village his name was Wac³aw Engelhardt. both my in-laws have sadly passed away it was hard to ask them to much as it was very painful for them
See sjam's post above with the contact details for the MoD, Polish Affairs.
The MoD will only release service records to a next of kin. So you will need a) proof of grandfather's death (death certificate) and b) that you are his direct next of kin.
The MoD will send you a "Certificate of Kinship" form which you have to complete and send along with the documentary proof you are your grandfather's next of kin. If your grandmother is alive for instance, the law is that MoD would only release this information to her and not you. There is a fee of £25.00 also.
You can download the "Certificate of Kinship form from here:
Contact address for Polish service records (don't worry that it has RAF in the address; all Polish service records are archived here) at MoD:
APC Polish Enquiries,
West End Road,
Tel: 0208 833 8603
Fax: 0208 833 8866
e-mail: firstname.lastname@example.org or email@example.com
The Polish Institute and Sikorski Museum in London:
The Polish Institute and Sikorski Museum, 20 Princes Gate, London SW7 1PT, Great Britain.
Telephone: +44 (0)20 7589 9249
The Sikorski holds all the unit records of the Polish Forces of the West including the listings of service men and women, but you would need to know what unit your grandfather served with as these records are all paper documents not a searchable database. They don't have email so you need to write or phone. The head of the archives at the Sikorski is Mr Andrzej Suchcitz. As the insitute is manned by volunteers (mainly Polish forces veterans) replies can take some time but they will reply.