This is a Di Gilpin design, knitted in the Shetland Aran she used to sell when she had her shop on the Isle of Skye. We often go to Skye on holiday. The pattern was called "Sheol" which means "Stone". It originally had a patterned yoke, gansey-style, but Mike asked for it to be plainer. The dark marl reminds him of the gabbro of the Cuillin mountains, his favourite place.
Although it's plain, I had no end of trouble getting the front and back the same, and actually had to knit a 10 stitch wide strip and graft it on to one of the pieces to make it the right width!