Sizewell B is the UK’s only Pressurized Water Reactor (PWR). You can find out more and request a tour by contacting Sizewell B visitors centre. And to find out more about the plant by visiting this link.
We visited the site in Summer 2016, starting in the Visitors Centre the tour started with a classroom session, before passing though security for a guided tour encompassing the sea water intake, cooling plant, and the turbine hall. Sadly no entry into the reactor building or the control room, but still an informative tour.
Sizewell B, Leiston, IP16 4UR