In the end, we just parked on the single yellow line just outside the station, as that is only restricted 10am to noon on weekdays. It is still unclear to me whether dropping off is permitted at the new entrance. There is a sign saying that free parking is available in the spaces outside the new entrance between 1700 and 0400 but it is chargeable at other times. I take the point that it is not listed as a station with ANPR but I wouldn't take the risk. The car park is still run by APCOA so one has to assume it is super strict.
However, whilst I was there I observed people dropping off on the double yellow lines clearly marked as an area to be kept clear, and even saw someone drop off in the bus lane.