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.

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.