I presume you're talking about a talkdown which has electronic glidepath information displayed to the controller because not all 'GCAs' (a generic term which might include radar or D/F) have glidepath guidance.
With PAR (Precision Approach Radar), initially a late reaction to the instruction 'begin descent NOW.......'
If the pilot continues to 'fly high', the controller will continually update the instructions to the pilot.
Last edited by chevvron; 25th Oct 2022 at 11:20.