The five types of stalker and how to spot them

Earlier this year, the Netflix program Baby Reindeer brought stalking firmly back into the zeitgeist - sparking discussion about the psychology of people who stalk and the impact it has on victims. So what goes on in the mind of a stalker? How do the various types, from incompetent suitor to intimacy seeker, differ? And what should you do if you think you have a stalker?