The Yellow driver should have been aware that you have priority when turning right and should have been pre-empting that possibility even if you weren't signalling.
There's a mini roundabout I drive round most days (a proper raised one too not just painted) and I've seen several drivers recently approaching from the same direction you were and just the cut the island out completely turning right as they're too lazy to steer round it!
There's a mini roundabout I drive round most days (a proper raised one too not just painted) and I've seen several drivers recently approaching from the same direction you were and just the cut the island out completely turning right as they're too lazy to steer round it!