Just a thought on the lack of visibility of the 958B sign and ignoring the driver behaviour after parking.
Traffic Signs Manual Chapter 3
Section 9.3.8 says:
'...There is no specific requirement to use the road marking in conjunction with diagram 959B
which means that they need not be placed together at particular locations. It is for the traffic
authority to determine the number of upright signs and road markings that are required and
where they are placed. However, the marking must not be used as a substitute for diagram
959B, relying only on diagram 958 to indicate the vehicles permitted to use the lane; the
Regulations prescribe the marking as being a bus lane that may be used by vehicles indicated
on the sign to diagram 959B'
If I read this correctly there MUST be a 958B and they cannot rely on 'Bus Lane' road marking to convey the restriction.
There are no repeater 958B's I can see on GSV since the start of the bus lane which is way, way back.