I recently decided to undertake a little research into how many television series of the 1950's and 1960's still exist in their entirety in the ITV and BBC television archives. Here's what I unearthed:
The Adventures of The Scarlet Pimpernel (ITV 1955) starring Marius Goring complete series of 18 episodes.
African Patrol (ITV 1958-59) starring John Bentley complete series of 39 episodes.
Colonel March of Scotland Yard (ITV 1956) starring Boris Karloff complete series of 26 episodes.
Dial999 (ITV1958-59) starring Robert Beatty complete series of 39 episodes.
Fire Crackers (ITV 1964) starring Alfred Marks complete series of 13 episodes.
The Human Jungle (ITV 1963-65) starring Herbert Lom complete series of 26 episodes.
Interpol Calling (ITV 1959-60) starring Charles Korvin and Edwin Richfield complete series of 39 episodes.
Maigret ( BBC 1960-63) starring Rupert Davies complete series of 53 episodes.
The Man in Room 17 (ITV 1965-66) starring Richard Vernon complete series of 26 episodes.
Mr Rose (ITV 1967-68) starring William Mervyn complete series of 24 episodes.
OSS( Office of Strategic Service) ( ITV 1957-58) starring Ron Randell complete series of 26 episodes.
The Pursuers ( ITV 1961-62) starring Louis Hayward complete series of 39 episodes.
The Silver Sword ( BBC1957-58) starring Melvyn Hayes and Frazer Hines complete series of 7 episodes.
The Strange World of Gurney Slade ( ITV 1960) starring Anthony Newley complete series of 6 episodes.
The Sullavan Brothers (ITV 1964) starring Anthony Bate complete series of 26 episodes.
The Third Man ( BBC 1959-65) starring Michael Rennie complete series of 77 episodes.
Undermind ( ITV 1965) starring Jeremy Wilkin complete series of 11 episodes.
White Hunter ( ITV 1958-60) starring Rhodes Reason complete series of 39 episodes.
Zero One ( BBC 1962-65) starring Nigel Patrick complete series of 39 episodes.
I think it is highly likely that most ,if not all, of the ITV series will get a commercial release on DVD, probably by Network. I base this premise on the fact that Network have already released a large number of ITV's 1950's and 1960's television output. I have been in touch with Network and they tell me that they will continue to give a release to many more television series in the future. Unfortunately the outlook is not so rosy where the BBC series is concerned and I cannot see any of the shows in the above list being given an imminent commercial release.