The Forties 5 Open Aquifer unit was selected as one of the five CO2 storage targets that will be progressed to WP5.The sheer size of the unit means that it is not sensible to consider the development of the whole site in a single phase.The purpose of this supplementary workscope is to:Identify through more detailed work an appropriate site to initiate CO2 injection within the Forties 5 unit such that the potential of Open Aquifer systems can be developed and matured.To reconsider those previously eliminated large oil fields of the Central and Northern North Sea which have significant EOR potential as a fall back location, in the unlikely event that a suitable Forties 5 injection site cannot be identified.