Use terminal maps to plan your drop-off or pick-up point; some ride-hailing apps designate specific zones

https://telegra.ph/Central-London-to-Heathrow-StepbyStep-Directions-via-Tube-Train-or-Taxi-08-17

Use terminal maps to plan your drop-off or pick-up point; some ride-hailing apps designate specific zones, and short-stay car parks are signed clearly.