Times (UK): Two cool and wet summers in a row have left butterfly numbers at their lowest for more than a quarter of a century. One species, the high brown fritillary, has almost died out in Britain and several others have suffered dramatic slumps. For a dozen species, last year was the worst on record and conservationists fear that they could suffer long-term damage if there is a third dire summer this year. Even butterflies that were once common garden visitors, such as …