I just re-watched series 1 & 2 of The Tripods having never seen them since I they were first aired on the BBC when I was a small child, so I had little to no expectations other than a few hazy memories of Tripods and trees, and I thoroughly enjoyed it. Good fun even if badly acted. However I was disappointed that it ended so open and on such a down beat note. I read that there was a supposed to be a third series but it never went into production. Does anyone have any more information on why this was?