An SNP MSP has written to WH Smith over its lack of bottled water from Scotland at its shop in Waverley station.

Former Cabinet minister Richard Lochhead complained to the retailer about it selling "mainly imported products".

Lochhead served as rural affairs, food and the environment minister for nine years in both Alex Salmond's and Nicola Sturgeon's devolved administrations.

In the letter to the retailer, Lochhead said: "I believe it is especially important that retailers in high-profile locations such as our main railway stations promote Scottish products given that these stores can act as showcases for what Scotland has to offer.

"Often your stores are the first port of call for visitors arriving in Scotland and WH Smith can play a role in helping promote our food and drink to tourists passing through our railway stations and airports.

"I note that at your busy Waverley store in Edinburgh for instance that you sell mainly imported products including even bottled water.

"I believe that this is a missed opportunity for both our food and drink industry and WH Smith. I would be grateful if you could let me know if you would be willing to consider making your stores, particularly your high profile stores, showcases for Scottish products".

His complaint to the company regarding the source of their bottled water has been mocked by the deputy leader of the Scottish Conservatives.

Jackson Carlaw said the letter, as well as a motion put forward by a fellow SNP MSP earlier this month linking Brexit to smaller Toblerones, shows the party's parliamentarians have "lost the plot".

He said: ""It's almost like nationalist politicians have some kind of bet on who can come up with the most ludicrous grievance.

"If they're not urging the UK Government to intervene on the Toblerone row, they're whinging about bottled water brands.

"That Richard Lochhead thinks this is a top priority demonstrates just how much he and the SNP chocolate munchers have lost the plot."

A spokesman for WH Smith said: "We're proud to stock our Scottish stores and cafes with a wide range of Scottish goods including Scottish milk, and pies from Strathmore Foods, as well as books and souvenirs.

"We are particularly supportive of Scottish authors with in-store events, and participate in local school-led or other literacy activities."