Supervision
As a matter of fact, there is some confusion with regard to FI(r).
An AFI may only instruct when an FI is present for the take-off and landing, true.
That is not the case of an FI(r). The supervision of the FI(r) is of a general nature and the supervising FI ( or any other ) is not required to be present when an FI(r) is instructing. An FI(r) may work alone. FI's acting as supervisors are required to be registered to the CAA and the same should subsequently sign the form confirming the FI(r) has met the requirement to have their restriction removed. The extent to which supervision is required of an FI(r) is not stipulated.