Just to let you have a few photos of my garden project. It took me a bit longer than I thought but feel it's been worth it.
Sunken Patio to the left and raised bed to the right.
Many thanks for the great photos. A very pleasing symetrical design that reminds me of some of the great classical ornamental gardens. The outline shapes were often constructed with small box hedges, but here you've used railway sleepers to great effect!