Scottish FISO service is available at FL55 and below in the geographical confines of the following sectors; TMA, TAY, ANTRIM and parts of WESTCOAST.
Radar services are available at levels above FL55 subject to controller workload and certain level restrictions due to terrain for Deconfliction Service.
Heading EAST from BLACA you will get ATSOCAS firstly from the ANTRIM sector on 123.775 and once below the airways system in the vicinity of DCS you will be working the TAY sector on 124.5.