Now looking for BA flights LGW <> GLA in September 2000. Outbound from LGW Tuesday 12th September, inbound from GLA Wednesday 13th. I remember it was dusk as we returned and I was looking down onto empty roads, this being the week of the great fuel strike, so probably about 18:30 (sundown is just after 19:00).

Can only have been BA, as according to the very useful punctuality stats for British Airports the only scheduled services were BA.