I've not heard of any - the first proofs were the 1971 set. I think those were struck in the early 70s at the London Mint who were too busy before 1971 to bother with proofs.
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Footnote:
I've just entered values for George VI and almost across the board those prices have increased. It seems his reign has been undervalued and is now catching up. (Mind you, mostly there are only values for EF and UNC - but to compare, Elizabeth II is static.)