Gold Britannias were first issued in1987. Four coin Britannia proof sets have been issued every year since 1987. I can find nothing further back than that for Britannia Proof sets.
Link Poke around their site, they've got a Britannia page (not just about the proof sets). The picture of their 1997 set is the the one I got from them .
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I can find nothing further back than that for Britannia Proof sets.
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Cathy