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

https://www.mediafire.com/file/wng8cpm7fhpu7wm/pdf-67015-5136.pdf/file

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.