Also, what type of ATS does an Aerodrome FISO provide?
It cannot be Basic Service because an Aerodrome FISO is required to provide traffic information. CAP774 says so.
It cannot be Traffic Service because a Traffic Service shall only be provided by a controller with access to an ATS surveillance system. CAP774 says so.
Could it be that Aerodrome Flight Information Service Officers provide Flight Information Service?
What 'type of service' are Aerodrome FISOs supposed to inform service recipients?
Does ATSD even know?