Summary: 2018 using Renewable Energy Foundation data
In 2018 UK Weather dependent renewables generated some 7.7 Gigawatts of power from an installed fleet of ~34 Gigawatts achieving a satisfactory overall capacity factor for Renewables of ~23%. The installed fleet cost ~84£billion in capital costs with average costs of ~11£billion/Gigawatt produced in capital costs and ~42£billion/Gigawatt produced long-term. Because of the comparative capacity factors Offshore wind and Solar PV were roughly equivalent in capital costs at ~15£billion / Gigawatt produced and ~60£billion / Gigawatt produced over the long-term. The direct comparison in the UK situation with similar measures for traditional generation technologies, Gas-firing and Nuclear, can be seen to be substantially lower above.