M609,
Send me your £10 now...............better still send it to BBC Children in Need.
Edinburgh have CAA approved ATC.
Form the control tower it is impossible to view one of the runway thresholds because the Airport Terminal was built in the way.
In order to view the holding point and runway threshold they use a CCTV system. The same system is used to view some of the stands.
Thus Edinburgh ATC operate a CAA approved CCTV ATC system. The tower could be located in london with the CCTV piped in.
Regards,
DFC