I didn't do a prior site survey but I would deduce naturally regenerated Birch (Betula pendula or pubescens), Willow (Salix, probably, caprea), Oak (Quercus, probably, petraea) and Rowan (Sorbus aucuparia). I've no problems with cutting or removal, but replacement with suitably sited, appropriate species is most important. Beech (Fagus sylvestris) is, in my experience, not a suitable replacement species for such a site.