I'm sure it was the other driver but their reaction has left me doubting myself!
Screenshots of the route and street view attached.
I'm red, they're blue. The hair pin bend is on a very steep hill, which I was going down as they were coming up. I know this bend very well and was going slowly (I'd say about 10mph, I didn't actually have an eye on the speedo but that's the speed I'd usually approach that bend at, and I was driving as I usually do) because it's a very sharp and very steep corner and often quite muddy due to water and soil run off from the fields behind. The other car was coming up faster but I wouldn't like to say how fast. The road is wide enough for two vehicles (so not single track) and I was well over to my side.
It's a blind bend until you're at least halfway round it. The other car went straight across my path to take the road that looks "straight ahead" but is actually a turning, marked by white lines. I braked hard and stopped with inches to spare.
The driver got out and started berating me? And I started to cry (was a bit flustered anyway as it had been so close) and didn't want to get out or even open my window or defend myself to him because he was so angry and so certain he was in the right.
However I drive that road most days and have done for about 6 years, and in that time I have actually never seen a car take the turn he was taking (it doesn't really go anywhere and just isn't used much), so I will admit that I don't expect anyone to take that turn so maybe I wasn't careful enough checking that nobody was coming that way? But even so, am I right thinking he was technically turning off (even if actually keeping straight on) so should have stopped to check first?