Alex Macqueen
From Tardis Wiki, the free Doctor Who reference
Alex Macqueen is a voice actor who has played Gabriel in the Big Finish Doctor Who audio story Paradise 5 and the Reborn Master in UNIT: Dominion and Dark Eyes 2 and Dark Eyes 3.
He played Julius Nicholson in The Thick of It opposite Peter Capaldi and also appeared (as another character) in the film spin-off In the Loop.