Old Mart –
The Winfrith site was more than just "one of " Britain's nuclear reactors.
It was the United Kingdom Atomic Energy Authority's main research site, and at its maximum had something like a dozen different reactors; all experimental. Most were small but two were of "production" size, and one drove a small power-station that fed surplus electricity to the National Grid. I think this was a joint Anglo-French project until the French unilaterally pulled out.
The site also had associated fuel-handling facilities, extensive engineering workshops, a full apprentice-training centre and so on.
The two big reactors, in an area fenced from the rest of the site, are now being scrapped. The remainder of the establishment has become basically an industrial estate under a fancy name; but does have high-grade companies on it.
The old story – we were among the world's leaders in nuclear-power research, but as with so much else, threw it all away.