Great, fast tap dancing from an act called The Three Emeralds.
Titles read: 'STEPS IN TIME! by The Three Emeralds'.
Pathe Studio, London.
Various shots of three men in natty suits doing a fast tap dance to the tune of 'Sweet Suit'. They're very good!
I would guess that their suits are green with a name like The Three Emeralds. The music speeds up towards the end of the routine and the men dance faster and faster.
This is a good one!