AirportPlanner1: "there is still plenty of availability before 6am and after midnight"
Technically there isn't. The government sets a limit on the number of night movements as well as a night noise quota at all 3 major London airports. LGW is at its limit & STN will be too this summer. Next year will see a revised series of rules which may see some changes but I won't get into details as I'm not really up to speed on these yet