A silver fork and spoon designed by Charles Rennie Mackintosh will be auctioned off to help restore tea rooms he also helped create.

The cutlery, valued at between £15,000 and £20,000, will go under the hammer at Lyon and Turnbull in Edinburgh on Wednesday, with the proceeds going to the Willow Tea Rooms Trust in Glasgow.

The items were part of a 12-place setting of dining cutlery commissioned by artists Jessie and Fra Newbery in 1902.

Celia Sinclair, founder and chairwoman of the Willow Tea Rooms Trust, which has been created to restore the building on Sauchiehall Street in Glasgow, donated the cutlery.

She said: "I am delighted that I am able to offer these beautiful objects for sale to benefit the work we are doing at the trust.

"The money raised from the sale will go towards the restoration of the tearooms."

The Willow Tea Rooms opened in October 1903, with Mackintosh at work designing it from the beginning of that year.

The premises were purchased by the trust in July 2014 with plans to incorporate a visitor centre to celebrate the building and other works by Mackintosh as well as restoring the tea rooms.

John Mackie, decorative arts specialist at Lyon and Turnbull, said: "I greatly admire the work the trust has undertaken to ensure the legacy of Mackintosh will be here for future generations to enjoy."