Jonnie Peacock (in-universe)
From Tardis Wiki, the free Doctor Who reference
Jonnie Peacock was a British Para-Olympian. Eddie Redmayne once accidentally summoned him when all he wanted was a runner to get his mobile phone. He then went off to find it and returned to him successful. (NOTVALID: Looking for Pudsey)
Behind the scenes
Jonnie Peacock played himself in the sketch.