Basically, a gravel bike that folds, and has the Brompton name on it. It's a bit of a lump, though, and buyers will need some convincing. The Brilliant Bikes presenter is about the same height as me, and by contrast the bike looks enormous. 20" wheels in the run of things are quite small, and only tend to look big compared with the original 16" ones but the need for fat tyres to convince potential buyers of its off road aspirations tends to pump up the dimensions.
Although it's a 20" wheeler will rail companies accept it as luggage like the original which is rack -friendly, or will it just be another folder which could be borderline for acceptance on a crowded train? If it's a case of just getting it into the boot of a car, there is plenty of cheaper and lighter competition.