TRESPASS — Whether and when defendants notified of withdrawal of implied right of entry for lawful purposes — Whether first defendant remained on plaintiffs’ property for unreasonable period after notification — Whether entry on public road dissecting property amounted to trespass — BREACH OF PRIVACY — Whether tort of privacy recognised at common law — Whether viewing of plaintiffs’ property from public road for purpose of gathering evidence a breach of privacy — VICARIOUS LIABILITY — For conduct of contractor — DAMAGES — Absence of evidence to support claim of psychological injury