Posted: 22/04/2016 at 07:57
Manure for the dry side too Alex. I know it sounds odd - but clay needs opened up in wet sites to allow for better drainage and manure helps with that, along with lots of grit and compost. In baked hard sites, manure will also help as it improves the structure and helps prevent it going solid. Plenty of extra compost as well - especially when you plant. I know - it sounds weird!
In addition, putting in planting that prefers the overhead conditions is the way to go. Right plant, right place