Directive (EU) 2016/1148 of the European Parliament and of the Council concerning measures for a high common level of security of network and information systems across the Union was implemented in the UK by he Network and Information Systems Regulations 2018 (SI 2018 No. 506). The NIS Regulations provide legal measures aimed at boosting the overall level of security (both cyber and physical resilience) of network and information systems that are critical for the provision of essential services and relevant digital services. This instrument ensures that following exit fom the EU, UK governance bodies can continue to be able to liaise, co-operate and share information with the EU where it is necessary and appropriate to do so whilst ensuring that they are not under an obligation to do so.
Also see EU Exit SI tracker