Retired kitchen worktop fabricator Michael Mullock, from Whitchurch, took on Anne Hegerty, Shaun Wallace and Mark Labbett during ITV's Beat the Chasers yesterday.
With the standard 60 seconds on his clock, the 73-year-old answered a series of questions correctly against the chasers, who had 44 seconds.
Winning with just five seconds to spare, Michael said he hopes live out his dream of travelling to Australia to watch The Ashes.
He said his competitors were "all so good", it "didn't matter" who he came up against.
"I wasn't concerned about how many chasers I faced, or which chasers either," Michael said.
"I was more concerned with the amount of time that they had as a start, as I was confident of winning, so long as the time difference was sufficient.
"The chasers are all so good that it didn't matter to me who I played against."
Michael added that the moment was "just a blur".
He said: "My family and friends will be pleased for me, but I'm sure I'll get some stick for not attempting a higher offer.
"I'm very much looking forward to watching myself, as I can't remember much about who I played against or any of the questions we answered as I was concentrating on the answers and had half an eye on the clock too – so it was just a blur."
Michael had been waiting for more than a year to have his shot against the chasers, having initially been invited onto the programme in January 2020.
"I was nearly on the first series and was invited down to London at the beginning of last year but they didn't use me," he said.
"They said they would keep in touch and I wasn't too sure, but they finally said yes they're going ahead with it despite the Covid situation."
Michael added: "I was always very confident of winning as I'm very familiar with the game itself and I know my limitations.
"I like to think that if the offers would have been slightly different I could have won a lot more."