I've also enjoyed Ivor's performances, mainly in this show where, as Inspector Large, he worked very well with Mike Pratt - another we lost far too soon. I haven't quite caught up with his similar role in The Saint because I've only reached the early stages of the second series, but am looking forward to his appearances very much. I remember Ivor mainly for his 'trademark' raised eyebrow, brought into use when he was suspicious of someone's remark much of the time!
These are all from the episode
Whoever Heard of a Ghost Dying?:
In Ivor's first scene in the series, he swivels his chair round to face Randall
Guest stars: John Fraser, Alexandra Bastedo (post-
Champions), Charles Lloyd Pack & Richard Caldicot
"If he's been working with the gang, he must know who they are"
With Mike Pratt as Jeff Randall:
Original ITV transmission: 9th November 1969, when
Sugar Sugar by The Archies was No. 1
Whoever Heard of a Ghost Dying? synopsis at Wikipedia
Thanks to wellendcanons for dedicating a thread to this distinctive actor. A great loss.