Carlisle to Gretna

On the CTC forums, someone posted about a neat new wee road which runs alongside the motorway from Carlisle to Gretna. I ended up having to google up the post again on my phone in the rain because the road is not really signposted. But once on the road it’s really good route. Smooth tarmac, direct route. It’s a bit exposed and locals use it as a strange rat run, but it’s way better than the alternatives.
So, here’s my directions. Left into industrial estate just before a7/motorway roundabout, pass by asda and further offices, ignore the deadend on the right as the road curves left, but do take the next turnoff to the right signposted for rubbish dump. Then just follow the signs for Gretna!