Thank you, Yes, I am actually waiting for replies from both, and keeping my fingers crossed that they have something. As for Karta, there is nothing there at all. At least, not so far. Maybe someday.
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I obtained all of these documents only in the last 5 years. The starting point for you should be writing to the Polish Institute and Sikorski Museum in London, England - you can find their address on the web they are in South Kensington, address the letter to the Keeper of the Archives who at the moment is Dr Suchitz. Give him all the details you have on the relevant family members i.e. what refugee camps they were in, their dates of birth and where they were born in Poland, where you believe they died etc. And they will send you a photocopy in the mail back of all the information they have. I obtained most of my documents from them. Note that it takes about 3 months for them to get back to you but it is worth it when they do!
Regarding Poles in military service alongside the allies all records are held by the Ministry of Defence also here in England. Again, another letter is required.
These two sources should turn up most of the documents you need.
The searchable online database Karta is another great source of information. I don't even speak Polish yet was able to get great information from it. It's not hard to figure out how to use it.
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