Section 2, subsection 2 of the Bill describes it.
(2) : For the purposes of subsection (1), a person causes harm to another person where—
(a) he or she, by his or her acts, intentionally or recklessly seriously interferes with the other person’s peace and privacy or causes alarm or distress to the other person, and
(b) his or her acts are such that a reasonable person would realise that the acts would seriously interfere with the other person’s peace and privacy or cause alarm or distress to the other person.