1960s music TV programme whose best-known presenters were Keith Fordyce and Cathy McGowan (5,6,2)

I believe the answer is:

ready steady go

(Other definitions for ready steady go that I've seen before include "that starts competition" , "order for competitors" , "Order for starters" , "Race starter's words" , "Instruction to start race" .)

I've seen this clue in The Independent.

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