Hi Will, nice to know your uncle owned a Dragon, I have always liked them, the club on the Medway where I sailed in the '50's had a big fleet of them and I sometimes sailed on one, 'Hai Lung' her sail number was 19 and was a pre war import to the UK. Some years later, I found her lying derelict in a mud berth in Faversham, bought her and restored her, but I'm sure the purists wouldn't like this, raised her topsides a foot, put a cabin top on her and re-rigged her as a gaff cutter so that I could enter Old Gaffer races.
The Swallows never became as popular as they should have done. I don't think I ever saw one outside the Solent and even there they had so much competition from other small keel boats like, the Seaview Mermaids, the 'XOD's'. the Victorys, the Solent Sunbeams and of course the Bembridge Redwings which had a very similar hull to the Swallow but a variable sail plan, any rig as long as it was 200sq.ft. I have often thought that the advent of the Flying Fifteen didn't help the Swallow, and then she was followed by the 5.5 metre and the Soling, which of course became an Olympic Class for a while.
However, I must say I very much regret the passing of many of the keel boat classes, but it was good to see that the Dragons and some of the local classes still had a start at the 2019 Cowes Regatta