It's Autoglym's metal polish, Similar stuff, but smells nicer, haha. You're right though, it does need treated with something else to 'seal' the shine in. There are bits which have slightly oxidised since being originally polished.
Pics are poor, but there is some progress!
Spent a bit more time on it since the pics were taken and just got a few bits to sort now:
* Fit rear gear cable and set-up. Having a problem removing one of the housing screws from the lever.
* Pick up another noodle for the front brake. Original one is at the end of its day.
* Clean up wheels
* Finish polishing frame. Going to mast around decals to prevent them getting damaged.
* Fit a silver handle-bar. The blue one is a bit too different.
"The things you own, end up owning you."