Re: It would be interesting . .
It's a good question. A lot of UK "industrial" demand has shifted from actual manufacturing to datacentres involved in service provision; hence total UK demand on the whole (adjusted for population growth) has remained relatively constant over the past 40 years.
Demand that used to be sucked up by aluminium foundries, steelworks etc has moved south to the datacentres.
I don't have the data at a sector level but can see it at Grid Supply point; and it is consistent with where big datacentres are clustered. I will ask this very question to the good people in ESO at their next round of Future Energy Scenarios.