One main reason British made steel can never compete on the world market is that we have none of the raw materials in the UK, Iron Ore, Coking Coal and Limestone (for flux.) All of these have to be 100% imported. The main energy source is gas which is bought ( imported again) at a competitive price. Electricity is a relatively minor cost in conventional steel production. Only around 9% of the total cost. However if we change to making steel from scrap then electric furnaces have to be used and the electricity cost will be a far higher % of the total.
I have said many times that basic steel making is a low tech and 'dirty' industry, we should leave that to India and China and concentrate on importing raw steel as cheaply as possible and then converting it to the high spec, high cost products we need.
If anyone wants to 'sabotage our industry', all they need do is to refuse to sell us or increase the price of, the raw materials.