Já sei!

Li agora a posição de Clegg no governo. Para os Ingleses, ser o número dois do governo é ser "Deputy Prime Minister", que será um equivalente a um Vice-Primeiro-Ministro, que existe em vários países. Deixo aqui a explicação sobre o cargo que retirei da página da Wikipédia e que pode ser mais esclarecedora - pelo menos para mim foi, porque desconhecia o cargo...

"The Deputy Prime Minister of the United Kingdom is a senior member of the British Cabinet. The office of the Deputy Prime Minister is not a permanent position. It exists only at the discretion of the Prime Minister. The office is normally considered as an honorific title.

Unlike analogous offices in some other nations, including the United States Vice Presidency, a British Deputy Prime Minister possesses no special powers above those of his or her ministry. He or she does not assume the duties and powers of the Prime Minister in the latter's absence or illness, such as the powers to seek a dissolution of parliament, appoint peers or brief the sovereign. He does not automatically succeed the Prime Minister, should the latter be incapacitated or resign from the leadership of his or her political party. In practice, however, the designation of someone to the role of Deputy Prime Minister may provide additional practical status within cabinet, enabling the exercise of de facto, if not de jure, power.^{[clarification needed]} When Gordon Brown became Prime Minister, he did not appoint a Deputy Prime Minister. However, in his third cabinet reshuffle in June 2009, Lord Mandelson was appointed as First Secretary of State effectively becoming the Deputy Prime Minister in all but name."