Sir David's appointment has been made as the hotel, which closed in December 2007 for refurbishment, confirmed that the reopening of the five-star, 268-bedroom property has been delayed again until September.
"There is no one reason for the delay, but once work started on the property the building was found to be in a far worst state than was previously expected," said a hotel spokesman.
The cost of the refurbishment has now far exceeded the original budget of £100m.
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