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By Saturday morning, there may be up to 5cm of snow for some places in the Brecon Beacons, eastern Cambrian Mountains and perhaps the higher parts of Exmoor.

The challenge is a project of Cambrian Mountains Wool, which is supported by the Cambrian Mountains Initiative, whose president is Prince Charles.

On the town square in Tregaron, a convenient base for exploring the Cambrian Mountains or the western coast, the 17th-century Y Talbot inn, above, offers board and bed in a stone-constructed pub with nine rooms.

He has said it is full of "nautical nonsense befitting a boat turned upside down" in the Cambrian Mountains.

Later, lamb from the Cambrian Mountains was the main course at lunch for the Queen and guests at Westminster Hall.