Nice bike! It’s somewhat amusing to see a Bob Jackson set up this way with the big boxy handlebar bag. That style, copied from old French touring bikes and lately revived in the US by Jan Heine and Rivendell, hasn’t caught on over here across the pond in the UK. Like all English touring bikes in the past 40-50 years, the Bob Jackson Super Tourist model was designed for carrying most of the load at the back. If you were going to have just one bag, in the UK it would be a saddle bag and preferably a cotton duck saddle bag made by Carradice. That’s still the fashion today in British touring circles. Perhaps this old French style will eventually catch on over here, but I doubt it. The British are much too attached to their own tradition.
I used to have a Bob Jackson Super Tourist myself, and it was a great bike to ride. While the quality of their brazing has varied over the years, and they sometimes got the clearances a bit too tight, they used, and still use, a tried-and-tested geometry for that kind of bike that makes it a pleasure to ride. Their finishes have also always been top-notch. I particularly love their enamels, like yours. The have a wonderful depth of colour and they hold up their shine for years thanks to the tough clear-coat lacquer. The 531ST tubeset was also great for touring bikes, although it could be argued that it’s overkill for a small or medium sized bike that’s never going to carry anything more than some stuff in a handlebar bag, or a saddle bag for that matter.
One day, you might want to try swapping the bar bag for a saddle bag. You’d find the bike handles even better! But maybe that’s only secondary.