" see Sir Arthur Watts Q.C., "
“Heads of State and members of their family who form part of their household are entitled under section 20(3) of the [SIA] to the exemption from immigration control conferred bysection 8(3) of the Immigration Act 1971 ”
“it has a function in international relations to protect the ability of the head of state to carry out his functions and to promote international co-operation”
“[i]n particular, the provisions of the 1964 Act would give him immunity from suit where the diplomatic agent, or in this case head of state, is carrying on a professional or commercial activity in the receiving state, that means in England”