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The correct procedures are: To teft turn – approach the roundabout with your left indicator on, check if it is safe to proceed and turn left.
Going straight on - think in terms of a clock. If you’re coming in at number 6 and looking to exit at number 12, then providing it’s safe to proceed, enter the roundabout (no signal needed). When you get to number 9 or about 90 degrees before you exit, put your left signal on.
Turning right – if you’re going to turn at number three, or go out the way you came in, you put your right indicator on as you approach and providing it’s safe to proceed you make your turn. When you get to 90 degrees before your exit, turn your left indicator on and away you go.
Giving way – a driver entering a roundabout shall give way to a vehicle that is within the roundabout.
Department of Transport - Drive safe handbook (See part 3 of the handbook)