Sir George,
The thread was started as BA allegedly have asked for a meeting with HAL to get rid of the switcheable reds and greens at Heathrow and Gatwick for 3 main reasons , which are at the start of the thread. The parking problem was highlighted as at present BA seem to have a dire shortage of staff to switch guidance on before an aircraft pulls onto stand. This blocks cul-de-sacs and taxiways, DELAYING aircraft.
This thread is about wether pilots prefer the switcheable system at LHR and LGW, where we can route aircraft without long verbal clearances, or not.