It's one of the leading sites for new-build nuclear in the UK, and if Hinkley Point C does happen, it'll be a PWR. Right now, the only operating civil PWR (naval reactors are a rather different matter) in the UK is at Sizewell.
I also had the Hinkley Point tour as a child and remember it fondly.
Do you remember whether you toured A or B? I am pretty sure we only looked around one.