We suggest planting in a double staggered row: 4 plants to the metre. To make a hedge stock-proof, your mix should include at least 50% thorn; Crataegus monogyna (Hawthorn) and/or Prunus spinosa (Blackthorn). A common mix includes: Acer campestre (Field maple); Cornus sanguinea (Common dogwood); Corylus avellana (Hazel); Euonymus europaeus (Spindle); Ilex aquifolium (Holly); Ligustrum vulgare (Native wild privet); Malus sylvestris (Crab apple); Rhamnus cathartica (Common buckthorn); Rosa canina (Dog rose); Salix caprea (Pussy willow); Viburnum lantana (Wayfairing tree) and Viburnum opulus (Guelder rose). You could consider Fagus sylvatica (Beech,) Carpinus betulus (Hornbeam,) Quercus (Oak,) and Tilia (Lime).
Beech hedging keeps its attractive withered leaves through winter but is slow to establish in the first year or two and suffers from water damage. Hornbeam offers similar attributes as beech but is faster growing and easier to establish especially on heavy or wet soils. New hedges require animal protection for around 5 years (see planting sundries below). We can advise on a suitable natural mix of species for your area and appropriate protection.
Spacing depends on intended ultimate height i.e. 180cm (6ft) high = 60cm single row spacing. 300cm (10ft) high = 120cm (4ft) single row spacing. xCupressocyparis leylandii (Leyland cypress) make an excellent uniform hedge if regularly maintained; Thuja (Western Red Cedar) quickly forms a good dense evergreen hedge. Taxus baccata (Yew) should only be planted where the drainage is good and the plants cannot become waterlogged. Special care should be taken not to over water especially on heavy soils.