• Ash (Fraxinus excelsior)
• Aspen (Populus tremula)
• Beech (Fagus sylvatica)
• Black Poplar (Populus nigra)
• Common Alder (Alnus glutinosa)
• Common Oak (Quercus robur)
• Crab-apple (Malus sylvestris)
• Crack Willow (Salix fragilis)
• Downy Birch (Betula pubescens)
• Field Maple (Acer campestre)
• Hornbeam (Carpinus betulus)
• Large-leaved Lime (Tilia platyphyllos)
• Mountain Ash (Sorbus aucuparia)
• Scots Pine (Pinus sylvestris)
• Sessile Oak (Quercus petraea)
• Silver Birch (Betula pendula)
• Small-leaved Lime (Tilia cordata)
• Whitebeam (Sorbus aria)
• White Willow (Salix alba)
• Wild Cherry (Prunus avium)
• Wild Service Tree (Sorbus torminalis)
• Wych Elm (Ulmus glabra)
• Yew (Taxus baccata)

SHRUBS

• Alder Buckthorn (Frangula alnus)
• Blackthorn (Prunus spinosa)
• Broom (Cytisus scorparius)
• Butchers Broom (Ruscus aculeatus)
• Dogwood (Cornus sanguinea)
• Goat Willow (Salix caprea)
• Guelder Rose (Viburnum opulus)
• Hawthorn (Crataegus monogyna)
• Hazel (Coryllus avellana)
• Holly (Ilex acquifolium)
• Osier (Salix viminalis)
• Privet (Ligustrum vulgare)
• Purging Buckthorn (Rhamnus cayharticus)
• Sea Buckthorn (Hippophae rhamnoides)
• Spindle (Euonymous europaeus)
• Wayfaring Tree (Viburnum lantana)

OTHER SPECIES

Early introductions usually considered acceptable in small numbers:

• English Elm (Ulmus procera)
• Grey Poplar (Populus canascens)
• Holm Oak (Quercus ilex)
• Swedish Whitebeam (Sorbus intermedia)
• Sweet Chestnut (Castanea sativa)
• Sycamore (Acer pseudoplatanus)
• True Service Tree (Sorbus domestica)
• Walnut (Juglans regia)
• White Poplar (Populus alba)

Later introductions which because of their aesthetic merits in appropriate locations can be considered acceptable in small numbers

• Common Lime (Tilia x europaea)
• Horse Chestnut (Aesculus hippocastanum)
• London Plane (Platanus x acerifolia)
• Norway Maple (Acer platanoides)