Summer 2021
Looking on the Aurigny website the BRS-GCI route is shown as just 4 x weekly next summer: Mon, Wed, Fri and Sun. Although in winter it usually drops to 4 x weekly it's been at least once-daily in summer for many years.
I looked after seeing the LBA-GCI route had dropped to 2 x weekly next summer although I don't think it's ever been daily. BHX-GCI also looks to have the same frequency as BRS-GCI next summer.
Aurigny operated from BRS on 4 December 2020 according to the BRS website arrivals/departure pages, the first time in ages, but I haven't seen it on the board since.