Having myself begun to use the airport since travel restrictions were lifted, I found myself booked on relatively early morning flights. Living in North Somerset, I would have usually taken the A3 bus from Weston to BRS. Given the airport now has a large number of departures (relatively compared to other airports at least), I am surprised this bus hasn't made a comeback even if in a limited reduced timetable capacity. I know the bus was frequented by staff who lived along the route, particularly in Weston and Worle.
Incidentally it seems the buses for the A1 service are stored in a carpark on the business jet terminal side of the airfield.