One for the Mods? I think the somewhat misleading thread title needs changing - my understanding is that only the Gatwick Express services are suspended.
I have changed the subject line from "Gatwick airport" to "Gatwick Express" ... and added more detail (just above). Not really a North Downs line topic but I have not moved the post ... there could be issues with Victoria to Reigate which is on the North Downs Line.
Reading to Gatwick running AOK (or to be more accurate "not significantly effected by this incident")