To my knowledge, this classic period thriller was last aired some time in the 90s on Channel 4. I taped it and then waited for a VHS (and more recently a DVD release). Seemed like it was never going to happen...
I watch this every so often, just for pleasure. None of your high-tech cgi needed here, and I hope they are never daft enough to do a remake.
Barry Jones is Prof Willingdon - the scientist 'on the edge' - being sought by Andre Morrell as DSup Folland of Special Branch, assisted by Hugh Cross (Willingdon's assistant).
Oh, and they have 'seven days' to find him before London is in big trouble. At 'Noon'. You get the idea.
It features a tense plot, and some wonderful observations on 1950's London. When else could the postie walk up to the door of No.10 Downing Street without a Policeman in sight?
One of the minor characters is Mrs.Peckitt, played by a young(ish) Joan Hickson.