Particle Size Analysis of grab samples from Inner Dowsing, Race Bank and North Ridge cSAC, and Haisborough, Hammond and Winterton cSAC (CEND 11/11). This survey, carried out on the Cefas Endeavour research vessel, used acoustic data and ground truthing to assess location, extent and condition of the Annex 1 habitats "Sandbanks slightly covered by sea water all the time" and "Reefs" in the Inner Dowsing, Race Bank and North Ridge cSAC and the Haisborough, Hammond and Winterton cSAC.