Enjoy forest bathing but don’t know your mountain ash from your downy birch? Never fear – fellow botanical ignoramus David Lintern has a beginner’s guide. Over the summer, we went camping with the kids on the moors, pitching up for a couple of days near a small burn. After a brief but rigorous interrogation that any parent will recognise, I realised I had no clue what the slightly scrappy looking trees that lined the banks were. It’s embarrassing to admit, but no surprise really – I grew up surrounded by bricks and concrete, far from where I stay now, and…