For peace of mind, allow at least 2 hours before short-haul flights when departing for Gatwick, and more for long-haul

https://www.hometalk.com/member/254102629/lettie1723371

For peace of mind, allow at least 2 hours before short-haul flights when departing for Gatwick, and more for long-haul. Add buffers for rush hour or weekend engineering.