Gliding in Scotland
You don't say whether you were flying in wave or thermal lift. There is a difference you know. However if you want to sample similar conditions in Scotland without heading for the Highlands (Aboyne) I can recommend two clubs near here in the Scottish Borders where there is a good chance of wave flying to quite high altitudes - 14000 -16000ft. One is Portmoak near Kinross and the other is Millfield almost on the border itself. Portmoak mostly winch launch which by the sound of it you haven't tried yet (strongly recommended for the sensation) and Millfield is aerotow only. Portmoak is a full time club - Millfield is weekends only.