If “the Google effect”on Britain is anything like “the Wild effect” in the US, there will soon be unprecedented numbers of people walking the national trails that traverse some of the most beautiful countryside in England and Wales. Wild was the name of a book in 2012 and, two years later, a film about writer Cheryl Strayed’s life-affirming journey along the Pacific Crest Trail, the longest walking route in the world, stretching more than 2,600…