Bookworm, the response I am looking for one of two responses:
"Visual with the traffic", in which case the pilot will be cleared for the approach and instructed to follow the preceeding or;
"Not visual", in wich case I will vector them and be responsible for separation.
(Here in Canada, there isn't the same "reduced separation in the vicinity" as in the UK.)
As I mentioned, I am just curious as to the "got him on TCAS" call, as it means nothing to ATC, they're still going to separate you. Yet it's something I hear on a daily, if not hourly basis.