
Mark McKinley was the Guiness World Record official adjudicator within Jay Rawlings' act in Series 13 of Britain's Got Talent. Mark informed Jay, his father, the audience within the studio [and at home after the act was televised], and the judges that Jay had to balance the chairs that he was to balance on his chin for a minimum of 10 seconds. Jay was helped by his father to place the chairs on his chin, as he succeeded to hold the chairs for the required length of time. Simon then congratulated Jay for setting a new Guinness world record, and claiming it from Mark. With eleven chairs balanced upon his chin for the required length of time, he had beaten the record, as he had planned to do. It seemed to be a bit of a miracle as he had only trained to have the ability to do six, after he found out that the original record was five. He then wanted to get from ten upwards on Britain's Got Talent after he discovered that the original record had been beaten by an American who had managed nine and to set another record on the show and follow in the footsteps of such acts as Hagrid The Dog, and Ryan Tracey who had both set a new world record on the show prior to Jay doing the same. In Series 14 he served as the adjudicator for Ryan Tracey's second appeareance on the show wherein he auditioned alongside his son Matthew Tracey as his "assistant", and deemed Ryan's attempt to reclaim his Guiness World Record from Australia's Got Talent act Jeremy Reading a success.