EGS International Ltd (EGSi) were contracted by Centrica Renewable Energy Limited (CREL) to undertake the 2015 post-construction (year 3) hydrographic and geophysical survey of the L&ID (Lynn and Inner Dowsing) windfarms. These works were conducted as part of a wider post-construction monitoring operation which included survey works on the adjacent Lincs windfarm. Additionally, a benthic survey was required for the Lincs OWF post construction survey. The L&ID windfarms are located in the southern North Sea, approximately 5km off the coast of Lincolnshire near Skegness. This series contains the operations, mobilisation and results reports for the L&ID array cables survey carried out on the EGS Pioneer and the bathymetry and side-scan sonar datasets.