This is someone who has had a rather varied career, which has included plenty of game shows. Matthew Kelly started out as an actor, and he first appeared on TV in the late-70s. By the early-80s, he was part of the Game For A Laugh team, alongside Jeremy Beadle and others. This was a very popular show, and for the next decade or two after this, he would remain a familiar face on TV.
Also in the 80s, he continued his acting work, appearing in some sitcoms, including Relative Strangers. By the mid-80s, he hosted a few other shows, and he also occasionally turned up on CITV. In the late-80s, he hosted short-lived daytime game show Quandaries. But it was going into the early-90s where he had his two biggest successes in game shows.
First of all, he replaced Bruce Forsyth as the host of You Bet! This was the show where if the challenger he backed failed, he would have to do a forfeit, and some of these were rather embarrassing, but he always took it in his stride. One of his biggest successes though came in the mid-90s when he replaced Leslie Crowther as host of Stars In Their Eyes.

This was the popular musical talent contest, and he quickly realised that this was a show where the contestants were the main focus, and he always encouraged them along the way and made them feel like, well, stars. He seemed to enjoy meeting people from various backgrounds who would perform as singers in various genres. He also wore some rather startling waistcoats.

He also seemed to relish hosting the specials, and grand finals that were shown live, and he would remain the host for several years. Going into the 2000s, he hosted Never Had It So Good, a daytime game show based around nostalgia that was fun but not exactly a success. By the mid-2000s however, it seemed that he had started to get a little disillusioned with showbusiness.
This meant that he departed from Stars In Their Eyes after over a decade in charge, but by this point the show was on the verge on becoming bogged down in celebrity specials and was never the same again really. He decided to return to acting, more on stage than on TV, but he did play a few straight drama roles where he came across as very different to his cheery game show personality.