Since GDPR is an EU regulation, it will generally no longer be applicable in the UK after Brexit. However, the UK government has incorporated GDPR into UK data protection law. So, from 1st January 2021 onwards, the UK version of GDPR, the “UK GDPR”, will be effective and companies will have to comply with it.
Most requirements remain the same as in the EU GDPR, so companies that are already compliant with the EU GDPR will not have to make major amendments to comply with the UK GDPR. However, doing transborder business might lead to additional requirements such as appointing a UK representative or ensuring compliance regarding international data transfers to and from the UK.