I'm sure I've seen a Heinz set, but can't remember the exact year, probably was 1983. On the subject of 1983, I have a set that seems to have been supplied by 'Martini'. It's exactly the same but has a slip of paper in it stating 'The Great British 1983 Coin Collection, with the compliments of Martini bla bla'. I'm sure I've also come across BU coins in other packaging, in fact, I'm sure I remember some kind of promotion as a child in the eighties when you got a coin in a pack of something (crisps, cereal, I can't remember) I remember getting BU pennies and I was once lucky enough to find a 20p! But those were just new coins in fancy packs so I don't suppose you'll want to include that kind of thing. I too have heard the same about the proof sets. I remeber finding out somehow that the 1970 was made in 1973, but I assumed it was so popular that it was made between 1970-1973. What you're researching is great, because even though they are decimals, comprehensive information about them exists nowhere despite the lack of age, and it is important that someone finds these things out somehow, and documents them!