We went on a morning walk up Dovedale, punctuated by talks about the trees by Thomas Pakenham, the great tree expert.   We began with the ash and the alder and a description of the difference between natives and invaders post-1500.   Then we had information about the origins of the Horse Chestnut – the false belief that it had come from Istanbul whereas it really came from the border of Greece and Albania.   And about the resilience of limes and their ability to reseed themselves:-