What gets me though is that a lot of roundabouts are marked for left lane for turning left only and they want you in the right lane for straight on or right. Because the councils keep marking roundabouts up differently to how the highway code says that they should work, it's no wonder people can't get their heads around them when there's no specific markings.
There's a roundabout near me and on one of the entries, you stay in the left Lane to turn right, as it's a three Lane exit and the other two exits are 2 Lane, plus a single Lane tesco entrance. Very weird, locals seem to use it properly but you reallyhhave to keep your wits about you asppeople frequently get confused.