Here are the average capacity factors for offshore wind farms in UK waters, newly updated to include data to the end of May 2022 (though there are still some figures to come through for the most recent couple of months, but only for the smaller windfarms). There are 40 operational windfarms presented here, and three closed demonstration sites.
2020 set a new record for the highest annual average capacity factor for a UK offshore windfarm: Hywind Scotland achieved 57.1% in the twelve months to March 2020. This floating windfarm, has behaved differently to any windfarm we’ve seen before, and that’s best portrayed in its load duration curve. The load-duration curves at the bottom of this page show the differences in distribution of outputs: click on the individual farm names in the legend, to toggle the display of individual curves.
You might be interested in comparing these with the capacity factors and load-duration curves for Belgium, Denmark and Germany.