Opportunity Knocks Hi, my dad has died recently and i found out he was on opportunity knocks around 70-78. mum's not sure, she said he went on a couple of times. not sure what name he used as he used either Tony Darren or Glenn Maddison. does anyone know where i could get more info from. he had a group when he was 15 called the vikings, then 60's 'The Guvnors' then on his own years after. i wish they had told me more years ago.