Since leaving Rockliffe Hall, which he joined a year prior to its opening in 2009, Holmes has been working as a consultant in the hotel sector.
He has now joined the team, in an advisory role, at the four-AA-star, 80-bedroom Ramside Hall hotel, near Durham, which is in the process of developing a £16m spa and leisure development, which will add an extra 47 bedrooms to the property.
"Ramside is a fantastic product and I am sure the new spa development, opening in May next year, will become a major player on the north east and UK spa scene," said Holmes.
"I am delighted to be able to bring my knowledge and expertise to help make the spa a success with the added bonus that the team at Ramside are great people to work with."
Holmes, who has previously worked at Gleneagles and Cameron House, said that his other consultancy projects include working alongside Peter Lederer, his former boss and retiring chairman of Gleneagles. Lederer is chairman of an Edinburgh-based company called Applecrate, which designs and develops lodge-style suites, a number of which opened earlier this year at the Isle of Eriska hotel on the west coast of Scotland.
"I've decided to join forces with Applecrate as they provide an ideal solution for hotels looking to expand their accommodation base, in a cost effective, efficient and flexible way," he said. "I'm of course particularly delighted to be teaming up with Peter again after all these years as I've always regarded him as something of a mentor and someone from the industry I respect enormously."
Holmes, who is chairman of the northern region for the British Hospitality Association, is also helping other hotels and golf courses on improving their spa and leisure facilities.