This is over 30 years old and basicly the style for this kind of music of the early seventies.
No overproduced video's , just straight live filmed and broadcasted on television, with playback on the sound.
At todays standard for professional music clips, it indeed looks silly...and the choreography is a low level, BUT
I DON'T GET A HEADDACHE OR GET NUTS LIKE I DO FROM ALL THOSE SO CALLED FLASHING MODEST HEAVILY OVERPRODUCED AND EDITTED MUSIC CLIPS OF TODAY!
So in other words Nigel I think they had it right
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76