The heather bed at the end of the patio has been a problem for years. It has been difficult to keep tidy and inaccessible in the middle. The access path to the side of the sun room was very tight and difficult, so a modification was in order.
Having removed the low brick wall, I ended up with a pile of dressed bricks and 36 bags of subsoil (basically dry clay). The loss of a conifer and a few poor quality heathers was not an issue.
With the new wall now built and the drain from the water butts enclosed behind it, all I need now are 12 2x2' slabs (600x600mm) to finish the job off. That job will have to wait until next weekend, after I have done my first week at work this season.