France, Greece, Italy, Portugal and Spain have regularised more than 3m illegal residents in the past 20 years.

法国、希腊、意大利、葡萄牙和西班牙已经在过去20年里承认了超过300万的非法居住者的合法地位。

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France, Greece, Italy, Portugal and Spain have regularised more than 3m illegal residents in the past 20 years.

ECONOMIST: Illegal immigrants

One way for both organisations to be sure that each has the other's interests in mind is for conversations between them to be regularised.

ECONOMIST: In defence of Europe

Britain has had a reserve of part-time or retired soldiers - often known as yeomanry - since the Middle Ages but the system was only regularised in 1907 with the passing of legislation creating a Territorial Force.

BBC: Philip Hammond with soldiers