Annex 2 of the Marine Licence (L/2013/00303) specified that a post-construction monitoring programme including benthic ecology surveys must be undertaken, which must also include a survey for Annex 1 habitats. Post-construction surveys are required to assess any changes in the diversity and distribution of benthic ecology populations in and around the developed site and to provide monitoring of ecological effects of the development. In October 2017, the Post-Construction Benthic and Fish Survey Monitoring Plan (Document Number: BOD-101-04-NPC-MWL-00006-A-02) was agreed with the MMO. This document outlined the benthic and fish survey monitoring plan for post-construction surveys as per the Marine Licence. All surveys conducted were undertaken in line with the post-construction Benthic and Fish Survey Monitoring Plan. This purpose of the report in this series is to provide BODL with a comparison of the post-construction data with the EIA baseline and pre-construction characterisation of the benthic ecology present in and around the Blyth Offshore Demonstrator Project. The document presents the findings of the benthic grab, epibenthic beam trawl and drop- down video (DDV) surveys, which were undertaken by Natural Power Consultants Ltd. An intertidal survey was also undertaken and reported on separately, this report is provided in Annex A.