This project examines the bird collision risk modelling surveys that were undertaken at the site of the Sheringham Shoal Offshore Wind Farm. The collision risk model used in this assessment is based on the model developed by SNH and BWEA (Percival et al. 1999, Band 2000), taking into account the appraisal of this model by BTO (Chamberlain et al, 2005). The model is essentially a mechanistic calculation assuming that flight patterns are unaffected by the presence of wind turbines. The outcome of the collision risk model is a theoretical numbers of birds at risk of collision, assuming that no avoidance action is taken by the birds. The probability that the birds will actually take avoiding action is then incorporated by multiplying the predicted collision rate by 1 minus the probability of avoidance.