Here are some useful websites and tools which can help you identify good potential solar sites.
DNO grid capacity maps
Western Power Capacity Map
https://www.westernpower.co.uk/our-network/network-capacity-map-application
Northern PowerGrid generation availability map
https://www.northernpowergrid.com/generation-availability-map
Electricity North West – Heat Map tool
https://www.enwl.co.uk/get-connected/network-information/heatmap-tool/
YouTube intro video for Electricity North West – Heat Map tool
https://youtu.be/dYu7x8NXdso
Scottish power – heat map
https://www.spenergynetworks.co.uk/pages/sp_distribution_heat_maps.aspx
Western Power Distribution Future Energy Scenarios
https://www.westernpower.co.uk/distribution-future-energy-scenarios-application
State of the Sector report
General info on UK Community Energy from Community Energy England
https://communityenergyengland.org/pages/state-of-the-sector