Sir Alan Sugar has denied using a booster seat to appear taller in the boardroom.

A makeshift wooden plinth has been spotted underneath Sir Alan’s boardroom chair in The Apprentice.

It has been claimed that the 5ft 6in tycoon uses a special seat to look taller when he declares “You’re fired”. But the fearsome Apprentice star said: “That’s a load of rubbish.

“The chair is fixed to stop it moving backwards and forwards while allowing me to swing to the left and the right.

“Anyone who watches the programme will know that I stand next to Nick (Hewer) and Margaret (Mountford) and the candidates, and I’m seen getting out of the car thousands of times.

“It’s a total joke. It’s there to secure the four wheels to stop it moving backwards and forwards.”

Sir Alan, 61, made the comments before the crunch final of the hit BBC One series.

He said of choosing the winner: “It’s obviously difficult when you’re down to the last four people that have gone through the whole process of 11 weeks. The decision gets a bit difficult.”

He said he had no regrets about his firings. The tycoon, who is set to make a fifth series of the show, said: “Certain candidates still keep in contact with me and I’m more than happy to continue a rapport with Simon (Smith), Raef (Bjayou) or Sara (Dhada).”