Two benthic biological surveys have been carried out to assess the ecological impact on the benthos of the construction of wind turbines and associated structures on the seabed at Scroby Sands off Great Yarmouth. This report presents the results of the second survey, in July 2005, following the construction of the wind farm. Subsequently the results are compared with those of 1998. The conclusions of this assessment show that the seabed over most of the survey area comprised moderately clean sand with a limited fauna of burrowing polychaetes and Crustacea. There were changes in the fauna between the years: the numbers of taxa and individuals were lower in 2005 and samples from different years belonged to different faunal cluster groups but the majority were assigned to the same biotope. It is likely that the observed changes were due to natural factors but data from an annual national survey or from other sandbanks would have been needed for certainty.