Part of Oral Answers to Questions — Deputy Prime Minister – in the House of Commons at 11:30 am on 12 February 2013.
Toby Perkins
Shadow Minister (Business, Innovation and Skills)
11:30,
12 February 2013
What the Government’s political and constitutional reform priorities are up to 2015.
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