Opportunity Knocks Episode 14.27 - Tenth Birthday Edition Of The Programme 4 February 1974 Tenth birthday edition of the programme in which some of Hughie's top discoveries including David Whitfield, Bobby Crush and Candlewick Green returned for the celebration and which meant that viewers would have to wait another week to find out if Lena Zavaroni would win for the fourth time. Evening Times 5 February 1974 Related Categories Thames Television Opportunity Knocks Hughie Green OnThisDay4February Comments