Jamie Oliver

Jamie Oliver was a cook.

When Glune Fex Fize Sharlaveer-Slam Slitheen posed as Greg Blakeman and made a speech infront of the students of the Park Vale Comprehensive School he farted. The students laughed. Glune explained that his wife gave him cabbage and bean tartlets the night before, and that this was another reason to despise Jamie Oliver. (TV: Revenge of the Slitheen)

Gita Chandra told Haresh Chandra that he was more of a Jamie Oliver than a James Bond. (TV: Prisoner of the Judoon)

When Clyde Langer cooked for the Leef Apple Glyn Slitheen-Blathereen and Tree Lorn Acre Slitheen-Blathereen Rani Chandra told Sarah Jane Smith that Clyde was "the secret Jamie Oliver" (TV: The Gift)

Information from invalid sources
Jamie Oliver was among the celebrities who promoted Red Nose Day by flying over Beanotown in a Red Nose-shaped hot-air balloon.

While in said hot-air balloon, he prepared a pancake in a frying pan heated by a Dalek. On the ground below, a police officer was attacked by Dennis the Menace and Gnasher, who shot the spikes off of a cactus as the officer's posterior. This resulted in the officer's dentures flying up into the air, making a hole in the hot-air balloon, with Jamie remarking "Blimey! Someone's 'ad a nibble of our big nose!".

The balloon, with the celebrities inside, then flew around the sky and crashed into a jam factory, with them letting out "celebrity screams". After walking out, covered in jam, Dennis ordered Gnasher to lick the celebrities clean, which Jamie thought "tickle[d]". A boy in a blue shirt recognised the group as celebrities, and left to get his "autograph booksy-wooksy". Dennis then told the celebrities to go and explore Beanotown while he and Gnasher fixed the nose. By this time, Jamie had prepared several pancakes. (NOTVALID: Dennis the Menace in Balloonatics)

Other matters
In the Fear Forecast for School Reunion, released on the Doctor Who website, one of the children, Samuel, notes, of the school dinner served at Deffry Vale High: "That's gloop! Jamie Oliver would kill them."