Thomas, please clarify something. Is that a four-way roundabout (x-roads) or a three-way junction (i.e. effectively a T-junction)?
If it is four-way then traffic arriving from opposite sides has equal priority. If it is three-way, then traffic would be expected to give priority to traffic arriving from the junction immediately to the right - or to traffic which is already on the roundabout.
If it is four-way then traffic arriving from opposite sides has equal priority. If it is three-way, then traffic would be expected to give priority to traffic arriving from the junction immediately to the right - or to traffic which is already on the roundabout.