David Lintern is woo’ed by the Beinn Eighe woodlands. This visit to Coille na Glas Letire – ‘the wood of the grey slope’ – was something of a pilgrimage for me; it’s where British Conservation stopped being theoretical and became physical. In 1951, Beinn Eighe and its surrounds became the UK’s first National Nature Reserve. At the start, there was much disagreement and debate about how best to care for the rare and beautiful fragment of Alpine rainforest that sits between Beinn Eighe and Loch Maree – after all, there was no precedent. Over the decades since, a range of…