Once I got the bike home, I loosely reassembled the bits the previous owner had removed, and took a good look over. It's generally in good restoreable condition. The only missing parts are the rear chrome rack, and the indicators. The indicators are Yamaha, so, should be relatively easy to find. Not sure about the rack though! I'll just have to wait.
The bike is an assortment of British, Italian, Japanese and American parts. It's surprising the ailing NVT bought it all together at all!
But, in my opinion, it's quite a good looking bike. It preceded the DT175 mono by some years, and was the first trail bike with a front disc brake. NVT (or BSA by that time), reverted back to drum brake on the later models. More on the contemporary history of NVT / BSA another day.
Apart from the master cylinder, I believe the rest is standard AT2 Yamaha, including the bars. So, the electrics should be reliable, unlike Italian wiring.