Other than the school diploma that wouldn't really prove anything for the Windrush people because it was about residency rather than nationality. The immigratio

Other than the school diploma that wouldn't really prove anything for the Windrush people because it was about residency rather than nationality. The immigration laws changed in the early 1970s so you had to prove you were in Britain before the change (and, IIRC, in some cases provide evidence for every single year you were in Britain for it to be considered valid). I could perhaps get some records from the school I attended, maybe? No idea if they still have records from decades ago. I certainly don't have anything from that lying around. Who still has records from their elementary school or high school? Some probably do, but I don't think it's uncommon for people to have nothing at all from that when they're in their 60s.