Diplomatic and consular intercourse and privileges — Permanent diplomatic envoys — Privileges and immunities of — Diplomatic envoys — The families of diplomatic envoys — Relevant date on which the right to immunity must exist — Communication of the Executive as to whether a person is a diplomatic envoy or not — Whether conclusive — Admissibility in evidence of the communication — Whether inadmissible as hearsay — Waiver of immunity — Whether diplomatic envoy competent to waive immunity — Insurance of car by diplomatic envoy — Whether a commercial activity depriving him of immunity — Whether amounting to waiver of immunity — The law of Ghana