As someone else pointed out, we aren't doing enough of these to iron out the kinks. If it's literally copy it might be going much better just because it's second.
Now we should figure out where to build third! It should go even better.
A decision will be made soon on building Sizewell C. Again, this will be the same as Hinckley C.
It should be noted that Hinckley C is penciled in to start operations in 2026. Hopefully if they give Sizewell the go ahead this year it will be in service 2031.
Especially as I'm in the UK, and we decided to build a copy of it (Hinckley Point) even after all the flaws become known.