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.

What were the prices like relative to the rest of the world 20-40 years ago when most of that industry was offshored?