For those in the USA, Smithsonian Channel has a new series "Planes That Changed the World" - the first episode is about the SR-71. At least to me, appears to be well done, lots of interviews with "real people" including design engineers and actual SR-71 pilots (including Bill Weaver, who miraculously survived when the aircraft broke up at Mach 3 after an engine failure). Lots of interesting design details, a few I didn't know about (although they neglected my favorite bit - that they used the exhaust from another jet engine to create the proper inlet conditions for the J58 engines at Mach 3
)
Next week appears to be the DC-3/C-47.
Not sure about you folks on the other side of the pond (or the lake to the west). I watched the credits and it appears to be a Smithsonian production (unlike programs such as Air Disasters (which is 'Mayday' rebranded) so I don't know if or when it'll show up elsewhere. Even in the USA, Smithsonian channel is considered a premium channel.