There isn’t a breakdown by city/region in the UK as the grid all comes under a single pooled network. Historically the UK grid was focused on coal which then migrated over to gas with the opening up of the North Sea fields. Over the past decade or two, there has been another shift, this time to renewables, and specifically offshore wind power. The UK has really focused on offshore wind, with 7 of the world’s top 10 operational wind farms are off the coast of the UK with the future 3rd, 4th and 5th largest in the world coming online this year and next. The target is to have 50GW generated by offshore wind by 2030 which would be enough to power every household in the UK.
Images sourced from National Grid Live: https://grid.iamkate.com