There were all these huge tripod "War of The World" type machine chasing kids about and trying to zap them. Some of the kids wer caught and had some sort of chip inserted into their head. Me and a friend both rememebr it but can't remember what it was called.
It was called Tripods. The Tripods were aliens who had taken over the world and kept everyone subdued with chips in their heads. Kids got them inserted when they got to a certain age but a small group avoided it and tried to destroy the Tripods. It's based on a trilogy of books. Can't remember the author. Could be John Christopher.
Totally different to Day of the Triffids. That's based on a book by John Wyndham and about a species of giant plants that can walk and kill people with a whip-like stinger. Everyone goes blind because they watch a meteorite shower and the triffids take over the world, all bar a few survivors who didn't see the shower and go blind.