You can find most of what you need to know simply by searching for Bamford watches or George Bamford online. That's what I did as I didn't know anything about Bamford either. The short version is that George Bamford is the grandson of the JCB founder, likes watches and enjoys modifying them especially with a black theme. He started with Rolex and has moved on to others including his own range. I think that the only relationship between Bamford and Bremont is through this watch. I imagine that Bremont liked the idea of a Bamford custom version and as they're both British companies it was quite fitting.
Having seen more pictures of this watch online it seems to be a brilliant design but it's also very polarising. There seems very few 'maybe's', almost all 'love it' or 'hate it'.
What has surprised me is the take up of this watch. In just a week, every piece has been sold. I can't fathom if that's because Bremonts customer base is increasing dramatically or whether there are just so many people who really like the design. Either way, it's been a success.