You have right of way over cars from the left once you are actually at the roundabout, not 10 yards before it still doing 30 mph. You shouldn't have to account for someone from the right going too quickly, assuming that they have a god-given-right of way before they're even at the roundabout.
This is my favourite roundabout for it. People from the right routinely just race towards the roundabout when they can see that straight on is clear; makes it a nightmare to get onto the roundabout from the camera view as you'll just get someone drive into the side of you as they can't stop, then try and claim it's your fault when you pulled on 10 yds before they even reached the roundabout.
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