Caterpillar species. Latin name: Biston stratulata Oak, hazel, aspen, elm Description: Grey, clouded and marked with brown, wart-like structures on segment 8. Most of Britain.
The Oak Beauty (Biston strataria) is a moth of the family Geometridae with a wing span of between 40 and 50 mm found in the western part of the Palaearctic flying from March to May in deciduous woods and parks.Found on http://www.probertencyclopaedia.com/browse/BO.HTM
No exact match found