Five sites have been selected from 20 for detailed evaluation. Key features of the Recommended Portfolio Inventory are:-Significant overall theoretical mid-case capacity of 1.6GT;Good geological diversity: 1 Permian, 2 Triassic, 1 Paleogene and 1 Lower Cretaceous age sites;Good diversity of site type: 2 depleted gas fields and 3 aquifers – 1 with structural closure and 2 more open; Understanding of all sites can be materially progressed through the project; Portfolio provides strategic build-out options from Phase 1 CCS projects.