The bridge on a proper UK-made D6 was not adjustable for intonation; only for action height. It was very similar to the bridge on a Watkins Rapier: two threaded posts set into the body (a bit like on an SG or Les Paul) with the bar of the bridge resting on two adjustable thumb wheels which could travel up and down the posts.
The only intonation which was possible was to shape the top of the bar for string position (eg, in the way that many acoustic guitar bridge saddles are shaped with a recess for the B string).
To be honest, it looked cheap and well below the standard of other Burns bridges. No wonder it was all covered up.