There’s actually 23 semiconductor fabs in the UK, presumably with a diversity of owners [2].
[1] https://www.theguardian.com/business/article/2024/sep/10/bri...
[2] tech uk report: https://pixl8-cloud-techuk.s3.eu-west-2.amazonaws.com/prod/p...
Both have announced plans to convert from blast furnaces to modern electric arc furnaces. This will greatly reduce emissions - they are among the largest industrial polluters in the UK (along with the Drax wood-burning power station). But conversion to arc furnaces also means that fewer workers will be required.
The UK exports 7-8 million tonnes of scrap steel every year, while producing about 5 million tonnes in blast furnaces. There's more than enough feedstock to replace all the UK blast furnace steel production with EAFs and still have some left over.