A gin-clear December afternoon in Richmond, N.Yorks, U.K..
Aircraft seen con-trailing over Grimsby to the south-east, and Isle of Man to the west, all verified on FR24.
Heading up The East Coast to Teesside in the days of the "hang a left at Clacton" experimental rmilitary airspace routing, it was great to see the "bump" of Kent, then the tapering shape of The Wash, all weather map-style.