Andy Murray's plans to refurbish a historic property in Kinbuck, Stirlingshire and convert it into a luxury hotel could come to a halt after conservation groups raised concerns over the relocation of a 400-year-old sundial and gate posts.
Historic Scotland told the Scotsman it was "disappointed" with the lack of detail in Murray's planning application for Cromlix House and said the historic structures are of "national significance".
It has asked for a report from a stone conservation expert before giving its approval of the plans.
In a letter to the local council, Simon Montgomery, of Historic Scotland, said: "We appreciate there is a significant urgency to getting this venture up and running as soon as possible and we hope we can be of assistance in resolving any significant planning issues quickly.
"We are therefore rather disappointed to see the drawings for this application really appear to be drawings for the new access and car parking, which therefore simply act as a location plan.
"We would really be seeking a report from a stone conservator with experience in conserving the likes of ancient carved stones and memorials, which confirms that dismantling and rebuilding will be possible without causing damage to them and the specification and new location will ensure their long-term future is secured."
Tennis ace Andy Murray bought Cromlix House near his hometown of Dunblane in February 2013 and revealed plans to convert the property into a 15-room luxury hotel.
The hotel dates back to 1874 and is set in secluded woodland within a 2,000-acre estate.
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