@DrewDad,
According to Izzy they're Tim Vine. I commented to Iz that I heard some of them in Lee Mack's voice. Which isn't surprising as they were both regulars on The Sketch Show.
And... drum roll.... Jimmy Carr also appeared in three eps of the same show.
It's weird how many of those dudes end up as panelists on humorous British quiz shows then evolve into hosts of humorous British quiz shows.
Feels like there's about 1 degree of separation between them through QI, Would I Lie To You, 8 Out Of 10 Cats, Never Mind The Buzzcocks, Duck Quacks Don't Echo et al.