The Ready, Steady, Go contest was a separate mid-week series "Ready Steady, Win". The Bo Street Runners were the eventual winners of the only (1964) series. An LP was issued on Decca featuring the contestants bo-street-runners.wikidot.com/ready-steady-win
Yes! Missing audio! Well spotted. I think - THINK it's from 11/09/1964. The final was - I THINK 18/09/1964. The Bo Street Runners had already won their heat, as you can hear at the end of the tape. The Toggery Five came second overall. Nice find!