I'm now watching a series from 1972 called Pathfinders. It's a WWII drama based on two Pathfinder squadrons. Pathfinders were bombers (usually Lancasters) that used to drop flares to mark bombing targets for other bombers. It's pretty good so far, am on episode 9 of 13. They're now using a more powerful radar so there's no need for flare runs.
One of the many excellent series from the 60s and 70s that are tragically gathering dust in a cellar somewhere rather than getting a deserved DVD release. I'm just glad that I'm a member of a members-only British TV torrent site, there's LOADS of stuff like this on there.
Contains real colour footage of WWII here and there too.