Note that I am the source of the Mapillary footage around the crossings.
Regarding Boulton Road roundabout exit edit: https://wiki.openstreetmap.org/wiki/Tag:junction%3Droundabout#The_roundabout_itself "Do not directly connect approaching with departing roads. 

Roundabout with correct connections
Each way which intersects with the roundabout should be connected to it with a separate node. Two ways which enter and exit a roundabout should never connect to the same node on the roundabout. This is required to allow routing applications and software to provide correct directions, otherwise the routing software will not correctly recognise the roundabout. With a segment of the roundabout between the entrance and exit, routers can safely recognise that a section of the roundabout has to be driven through."