Argh got someone in to do a simple bit of landscaping in the garden. They've done it right apart from the line of bricks set into the floor around the patio area.
The line is two bricks thick, instead of setting them in two rows so they overlap (like a brick wall) they have set them in two rows but with the bricks on top of each other.
This is all my own fault, dh insists on standing over tradesmen when they are doing work. I have to admit he has a point.