Dig a gully in patio and finish with shingle.
Keith was able to fit me in on a tight deadline and his team arrived bang on time and did a great job. They kept tidy and hosed down windows and patio afterwards; there was a lot of dust but you wouldn't have known. Furthermore, they were friendly, and wanted to go the extra mile to satisfy the requirement - as I needed to expose a damp proof course in preparation for cavity wall insulation they took care to ensure that there was sufficient depth and width of gully across all impacted walls. I will definitely use Mays Groundworks in the future - great service!