I agree 100% with the previous comments. A nice departure for this series was that the hero wasn't forever slobbering over women - in fact Drake remained impervious to their charms - a sort of 1960s Sherlock Holmes - without an Irene Adler!. Only 2 episodes were made in colour, and these were to form part of the 1967 series, but after the two episodes were filmed PMcG wanted to drop the series and make 'The Prisoner' which is another story. It is probably because they are in black and white that domestic UK TV has not rebroadcast these stories, but the UK satellite channel Granada Plus has the rights to the ITC catalogue, which made Danger Man, but they seem reluctant to repeat B/W adventure series, though they do repeat B/W comedy shows like the earlier series of 'On The Buses' and 'Nearest and Dearest' etc. Perhaps if enough people contacted them they might think again?.
At least one videotape is available commercially of Danger Man, I have seen it recently in a store in London, as there are 4 episodes on one tape I assume that these are from the 1960 series, when the stories ran for 30 minutes. In the early days of Channel 4 (1982) they rebroadcast all 39 episodes of the original series twice a week.