Well, it isn't really gravel. It's limestone, mostly one inch lumps. The limestone is a couple of inches deep, then there's six to nine inches of rubble underneath. There's 187 sq metres. In places moss has grown. I've killed the moss but under it the stone has a lot of soil mixed in, somehow. I'll have to scrape all this off and put new stone down, but how can I stop this happening again? I was wondering about waiting until the dry weather and getting some sort of blow torch thing? Ideas?
Bill