Stephen Yardley
From Tardis Wiki, the free Doctor Who reference
Stephen Yardley (born 24 March 1942[1]) appeared in two Doctor Who television stories: as Sevrin in Genesis of the Daleks and Arak in Vengeance on Varos.
He was also considered for the roles of Scobie, Bilton and Sheard in Time-Flight. (TCH 35)