Boris Johnson said he was backing David Cameron "all the way" and was "increasingly confident" the Prime Minister would win the 2015 election for the Tories, amid fresh claims about his party leadership ambitions.
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A colder start to the day with outbreaks of rain expected across Wales and southern England.
A further 85 buses are expected to arrive on Tuesday and Wednesday, with officials saying the entire operation will last at least a week.
The reality star had filed a defamation lawsuit against celebrity gossip site MediaTakeOut.com.