Very sensible I'm sure. It is common courtesy to indicate to let other motorists know your intentions. This is a problem caused by stupid people. If turning right, they just indicate right, including when they are leaving the roundabout and actually turning left. Thus it is impossible to tell if they are about to leave the roundabout, or do a full loop.
Middle lane hoggers Another problem caused by lazy people on motorways.
They seem to think that the middle lane is where you stay. A danger to themselves and others as their brain has obviously been left at home. You should drive in the left lane unless overtaking. Fortunately the law indicates that you can undertake if you are in a faster moving queue of traffic. Simple fact here - 'If you've been undertaken, you were in the wrong'.