Part of Oral Answers to Questions — Deputy Prime Minister – in the House of Commons at 11:30 am on 12 February 2013.
Nick Clegg
The Deputy Prime Minister , Lord President of the Council (Privy Council Office), Leader of the Liberal Democrats, Leader of the Liberal Democrats
11:30,
12 February 2013
As the hon. Gentleman and I have discussed before, collective responsibility prevails where there is a collective agreement and a collective decision on which collective responsibility is based. It is not easy, and certainly not possible to enforce collective responsibility in the absence of a collective decision taken first.
The office of Deputy Prime Minister is one that has only existed occasionally in the history of the United Kingdom. Unlike analogous offices in other nations, the Deputy Prime Minister does not have any of the powers of the Prime Minister in the latter's absence and there is no presumption that the Deputy Prime Minister will succeed the Prime Minister.
The post has existed intermittently and there have been a number of disputed occasions as to whether or not the title has actually been conferred.
More from wikipedia: http://en.wikipedia.org/wiki/Deputy_Prime_Minister_of_the_United_Kingdom