Hinckley Point C startup date was pushed back to 2029 unfortunately. With that said, if it can get done, that is a substantial amount of energy that can offset current UK fossil gas consumption.

https://www.reuters.com/business/energy/edfs-nuclear-project...

https://en.wikipedia.org/wiki/Hinkley_Point_C_nuclear_power_...

https://app.electricitymaps.com/zone/GB/72h