I was told ( not sure if it’s true ) there is a large newly planted ( last 20 years ) hardwood plantation an hour south of Edinburgh where some of the trees had truffle spores deliberately impregnated on the roots before planting. One of my farmer friends did the same a few years earlier when he planted wind breaks, I’ve always fancied trying the GWP and JR terrier at finding out if any have developed. Seems like a good exercise for the dogs.