Of the six Doctor Who (1963) serials he directed, it was one of his favourites was The Robots of Death: Part One (1977). It is also a favourite of the series' fans, being voted the sixth greatest story of the original run in Outpost Gallifrey's 40th anniversary poll in 2003. The one he most enjoyed making was The Sea Devils and feels it was probably his best 'Who'.
Television was growing at a rate and the creative side was run by people from the theatre or film industry. Directors in those days did the casting, were consulted during the writing process and had a freedom impossible today.