HC Deb 06 November 1972 vol 845 c62W
Mr. Kilfedder

asked the Secretary of State for the Home Department whether British citizens or those entitled to hold United Kingdom passports are entitled to join the regular standing army of a foreign Power, or a Commonwealth country, or another country within the Common Market; and what legal sanction can be taken against a British citizen or United Kingdom passport holder who joins such an army

Mr. Carlisle

The law places no restriction on the engagement of citizens of the United Kingdom and Colonies in the military service of a country at peace with Her Majesty save where that country is a foreign State at war with a foreign State at peace with Her Majesty.