Arrange a licensed minicab or ride-hailing service with airport drop-off; confirm your terminal

https://www.scribd.com/document/1074920514/Getting-to-Heathrow-from-Gatwick-Easiest-Inter-Airport-Transfers-178501

Arrange a licensed minicab or ride-hailing service with airport drop-off; confirm your terminal and allow extra buffer for traffic on busy corridors.