Well, you couldn't include the T&W Metro; Central Station, Gateshead, Manors, St James, Monument and Haymarket are all staffed. I think Piccadilly on Metrolink is staffed, I think Nottingham Railway Station on the NET is staffed. The Supertram would count. The Beckenham Junction to Croydon loop of Tramlink service counts.
As for metro services down South, they all tend to be staffed at one end (which is usually a major London Terminus) or have connections with the London Overground, where all stations are staffed. Bromley North branch might count? I know SE don't staff most of their stations most of the day.
Bromley N was staffed part time last time I looked, and I imagine Grove Park is too!