A good place to start is having a look at these websites, check back soon and more will be added to this guide:

https://www.52climateactions.com

https://takeclimateaction.uk

https://www.carbonbrief.org

https://beethechangeblog.co.uk

https://friendsoftheearth.uk

https://www.greepeace.org.uk

https://www.ecosia.org

https://www.cat.org.uk

https://www.iea.org