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HI, in answer to questions/answers - been on wikipedia - it doesn't give heights of the actors unfortunately, though thru x referencing I've found most!
No, there isn't a particular reason, just watching it yesterday with a friend's son and I decided I wanted to know how tall the actors were! It's just one of those trivia kind of things!! Sad, I know!
Re Milo - I think he was played by either Chris Beck or Matthew Lyons!
....and most of the 'kids' seem to have been played by actresses who are approx 5' tall!