Thanks both, very helpful. Sounds like, as I suspected, the best thing to do to be sure of a good result is to dig it all out and start again. Hope the weather stays good!
My drive is currently very scruffy-looking tarmac - lots of potholes and it looks like somebody has spilled a load of concrete on it at some point. I want to lay a gravel drive and have heard that putting gravel directly onto tarmac (after filling the potholes obviously) isn't a great idea. So my qu...
