How is this still available? A classic, British early 50's....at the dawn of the classic lightweights!
I'd sling as much GB stuff on it as I could, Williams or Durax chainset, and a simplex or Benelux derailleur, and roll with that as it is...geared!
A bit of a waxing, to bring out the colours.....and don't you dare fucking 'restore' it!!