Don't park - pull into the petrol station and wait there until your pick-up calls ( tell them to wait at departures level ) ask them to ring to say they are ready then drive up the Departures ramp and park down the far end and collect them - sorted
Silly? I frequently use it if I'm only on a day flight to UK. Booked in advance it's about 30 for a full day.It would be silly to use short term car park if you were the one travelling - cost you same as flight cost !!!
Bet your costs are covered by Company expense account