Buzzer:
Hi all if you look up David Brown Ltd on Wikipedia it will tell you the full history, if one knew how I would have attached it here but beyond my IT skills, Buzzer
All you have to do is post the link 
: en.wikipedia.org/wiki/David_Brown_Ltd.
I’m more after the gearbox side of things: were they synchro or constant mesh? What were they like to live with? That sort of thing.