I live in a small country town in Scotland) where it is wise not to act on anyone else's signal - as they often do something different! eg if I am waiting at a junction to turn left onto the main drag and another car is approaching from the right, indicating that they are about to turn left into the road I am exiting -- they might not actually do this but continue on the main drag! And it would be my fault if I pulled out in front of them -- -
You get similar situations with people indicating to go right - then turning left, or continuing on -- -
So - NEVER assume the signaller will do what they are indicating!
(some locals stay on our side of the water, only drive in our peninsula / country area - never cross by ferry to the 'mainland' which has traffic lights, roundabouts, motorways and worse - bus lanes and worst of all - a bus gate in Glasgow that has made an absolute fortune for the city fathers catching people out with automatic fines via the cameras!
-- We do have a couple of mini roundabouts in our town - - and it is so funny to see three or even four cars sitting one at each   entrance, none of them understanding who should go/or who should have gone!
Mind you we do get our own back on you sophisticated city drivers when it comes to night driving in the country - no street lights, or single track roads- - country folk are pretty cool about those scenarios!