Those early morning Cityflyer GLA-LCY flights were never normally operated by the EDI base, and even the EDI-LCY earlies were sometimes operated with LCY crews. They are only temporarily not operating due to reduced demand, back in the schedules from 6th September. Earliest southbounds from that date as follows;
0625 departure EDI-LCY
0630 departure GLA-LCY
0645 departure BHD-LCY