Diet composition and prey consumption were estimated using scat sampling methods as previously used in 1985 and 2002 and as described in detail in previous reports to Defra and Scottish Government (Hammond and Grellier 2006, Hammond and Harris 2006). Scats were collected on a quarterly basis for one year in 2010/11 around Scotland and along the east coast of England. Fish otoliths and cephalopod beaks recovered from scats were identified and measured, corrected for partial and complete digestion using experimentally derived coefficients, and the data used to estimate the contribution of each prey species to the diet as a proportion of the total estimated weight consumed. Diet composition was estimated regionally (Inner Hebrides, Outer Hebrides, Shetland, Orkney and northern North Sea, central North Sea and southern North Sea) and seasonally. Diet composition results were used to estimate the amount consumed of each prey species, assuming that grey seals, on average, met their estimated energy requirements. Annual consumption estimates were compared with the estimated size of stocks assessed by ICES in Subarea IV (North Sea) and Division VIa (west of Scotland). Results for 2010/11 were compared with those previously presented for 1985 and 2002.