Thanks again for all the detailed information. I think he has only 3
inches of top soil.
Another Gardening friend suggested using a 1½" auger and making 18"
deep holes
about 1 metre apart and filling with coarse grit but postings todate
seem to advocate a sand-soil mixture.
I will pass all of this on to my son in law. He is half my age so it's
up to him !!!!!
tom