Hazel 'Nottingham Cobnut' Tree / Corylus avellana 'Nottingham Cobnut'. Cultivar:'Nottingham Cobnut'. Corylus avellana 'Contorta' / Twisted or Corkscrew Hazel, 20-30cm Tall Shrub. Dig a hole that's at least two feet wider than the root system and about as deep as the point where the roots flare from the trunk (or stems in the case of a shrub).
eBay