Britain's Conservative Party Prime Minister David Cameron (R) and with Liberal Democrat Party Deputy Prime Minister Nick Clegg react as they answer a question from the media during a joint press conference inside 10 Downing Street to mark the half-way point in the five-year term of the coalition government in London on January 7, 2013. British Prime Minister David Cameron and his deputy Nick Clegg insisted their coalition would serve its full five years as they pledged fresh reforms to mark the midway point of their government.