Just speaking from personal observations yesterday :
I approached from Wigmore by long stay car park bus, solid traffic from the roundabout by the hotel. No idea how far it stretched back before that. This at 5:45 am.
Security busy but only a ten minute wait. The ex silverjet terminal appeared to be in use as an additional security area - is this correct?
I would say an extra thousand pax would be pushing it. Also all the night stoppers have to take off whilst the first wave of wizz arrivals are coming from the east. Runway capacities is another issue.