But 4 decades ago is exactly when nuclear was being built up in the UK - indeed, most of the AGR fleet came online between 1985 and 1989.

And "quite expensive" vastly understates it - high temperature gas-cooled reactors are in theory more efficient in operation at the expense of increased construction cost. In reality, construction costs far, far outweigh the raw cost of fuel (reprocessing is a different matter!) so we landed ourselves with all the extra expense for very little benefit (probably actually a negative benefit since the much-vaunted ability to refuel whilst at full power turned out not to work in practice).

So they were late, hideously expensive, completely failed to be sold to other countries, and now have an availability factor no higher than that of offshore wind.

We knew that they would be unlikely to live up to their promise as early as 1964 and yet still went ahead despite several opportunities to change course. The nuclear industry never learns.