Reynolds International Ltd (RIL) has been appointed by Dr Sophia Fannon-Howell of Centrica Renewable Energy Ltd (CREL; the Client) to provide geophysical processing of single-channel marine seismic data acquired for the Irish Sea Zone. As defined by the Client, the seismic dataset comprises 1003 lines, of which 537 are in IEEE format and 466 are in IBM format. A significant number of the IEEE lines have data saved to two channels. The raw data quality ranges from ‘good’ to ‘not interpretable’. Some lines do not contain navigation information in their headers, with these navigation data being supplied in separate navigation files. A bathymetry data archive consisting of x,y,z text files and PosMV data was also supplied. Initial investigation of the dataset, prior to the work in this report being commissioned, revealed that the two-channel IEEE data contains one ‘strong’ channel containing primary seismic data, and one ‘weak’ channel with near-zero amplitudes. The main aims of the processing were to: 1. Split the dual-channel data to single-channel data files containing the ‘strong’ channel only. 2. Improve the interpretability of the data through seismic processing. 3. Edit the SEG Y files such that they contain correct navigation data. Secondary aims were to: 1. Convert the x,y,z bathymetry data to grid format files readable by the KINGDOM seismic interpretation software. 2. Create auxiliary navigation files to ensure no loss of resolution in SEG Y file navigation data when processed SEG Y files are loaded into KINGDOM. Within this series, the processing report and two addendums are provided, as well as the seismic and bathymetric datasets.