Was coming out of a side road onto a round about, saw a moped coming out of the other entrance to the roundabout behind me and heading for the the inside lane, so I pulled out into the outside lane of the round about and took the first left hand turn. Some bugger came up behind me tooting, came right beside me, turning into me horn blaring. I didn't see him before I turned but he must of been going quite fast to have to brake like that. What freaked me out is he was beside me tooting and actually swerved into me, before he sped off. I take it he had right of way?