The five-AA-star, 282-bedroom Royal Horseguards hotel in Whitehall has appointed Graham Chatham as executive chef.
He will oversee the culinary operations of the hotel's One Twenty One Two restaurant, and has created a new menu, which launches this month.
Chatham, who has 26 years' experience in hotels and fine-dining institutions, joins from the Langham hotel.
After beginning his career at Le Meridien Piccadilly, he worked in restaurants in London, including Rules in Covent Garden, and spent two years cooking in Denmark.
He is a member of the Royal Academy of Culinary Arts and is also involved with Chefs Adopt a School, a programme run by the Academy which aims to tackle specific health inequalities and the lack of knowledge about food and healthy eating.
Chatham champions seasonal ingredients and is always looking for ways to update traditional dishes.
He added: "Suppliers are key to our success and the relationships we form with them to bring the very best ingredients to the table. Good husbandry, ethical animal welfare and provenance are what I insist upon."
Ian Fletcher, general manager of the Royal Horseguards, said: "We are so excited to have Graham Chatham on board as our new executive chef. He has incredible experience in creating exciting and inventive dishes and we can't wait to see what he has in store for the hotel."
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