Observations
There is neither a legal definition for stalking, nor relevant legislation (however the victim can be protected by other legal provisions e.g. provisions for threat).
This resource includes the legal definitions of different types of gender-based violence used in EU Member States, according to their legal terminology and national legislation. It was last updated in 2019 and makes a reference to the United Kingdom as a member state of the European Union.
There is neither a legal definition for stalking, nor relevant legislation (however the victim can be protected by other legal provisions e.g. provisions for threat).