@Speicher Your entire garden will have the mycelium of the honey fungus covering it. And your neighbours’ and more. It is also known as boot lace fungus because of the largest ‘roots’ but most of the mycelium is microscopic.
It is thought that the world’s largest living organism was a network of mycelium from a single honey fungus in the USA. It covered an area as large as the Yellowstone National Park.
It is impossible to remove and herbicides for domestic fruit is now illegal. Some plants are less susceptible to this fungus and young, healthy fruit trees don't suffer. It is only weak, diseased or old plants that suffer. Like all gardeners in U.K. you will have to live with it I’m afraid. Feed and water your stock well and you are in with a good chance.