A few years ago, with my good Swedish friend Maria, I enjoyed a relaxing stroll through the ancient ash, elm and oak woodland of the Borgen Nature Reserve in the Råån valley near Helsingborg, in the Skåne district in Sweden’s south.
As we wandered beside the chuckling waters of the Fjärestadsbäcken stream on a broad track through the mossy forest, I marvelled at the rich flora of the
