NIS introduction
https://www.ncsc.gov.uk/collection/caf/nis-introduction
The Network and Information Systems Regulations 2018
https://www.legislation.gov.uk/uksi/2018/506/contents/made
https://www.legislation.gov.uk/uksi/2018/506/made/data.pdf
https://youtu.be/isL1xNBfTjA