Just wondering what caused the delay to BA534 05/02/24 LHR to NAPles

LHR 2h 35m flight NAP
London · Mon, 5 Feb
Departed 19:30
Originally scheduled departure: 14:15
Terminal 5 Gate B46
Naples · Mon, 5 Feb
Arrived 23:05 Originally scheduled arrival: 17:55
Terminal -Gate XSCH

This caused the curfew cancellation of BA535 NAP to LHR rescheduled to today 06/02/24 12.40 // 14.25

More than a few rugger buggers affected !!