You may mean the superb black and white British series starring Richard Green which, when I was kid, showed weekday afternoons (this is in Boston, MA).
No surprise that Terence Fisher, one of Hammer's classic directors, was a regular director on the show.
Would not surprise me if this was the series Mr. Lee may have appeared on.
Here's the direct link for more info:
http://us.imdb.com/Title?0047706
143 episodes altogether. 1955-1960. The show also featured Paul Eddington (Richard in Devil Rides Out) as Will Scarlett (long before "Yes, Minister" for sure)
I remember being much more enchanted by this series than by the (admittedly excellent) Errol Flynn movie...