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We have expensive, potentially unreliable (if an interconnect fails we are completely fucked so certainly fragile), energy.

Energy is what allows modernity to function, we have made it so expensive that no one can make anything in Britain just in time for hard power and manufacturing to be really important again.

Chemicals, metals, pottery, glass,fertiliser etc are all basically impossible to do competitively in Britain.

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Energy has only been expensive recently, and there has been zero issue with power supply beyond silly tabloid fear mongering. So between the 70s and lets say 10 years ago, the argument for expensive power really does not hold true.
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UK has some of the highest costs of power in the world. There's a lot of demand destruction there, a lot of industries left. due to high costs.
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Which industries? If you're going to make that claim be specific. The UK has deindustrialised since the 70s which was nothing to do with electricity costs or availability. Any recent industries leaving are not covered by the stats here so would be pretty irrelevant, which means you're not talking about those, you're talking about something else for it to cover the period between the 70s and now.
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What were the prices like relative to the rest of the world 20-40 years ago when most of that industry was offshored?
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