UKIP claim to have called the cops in after their head office was “bombarded” by “really nasty ‘hate’ phone calls” ahead of tonight’s debate. The party says “a group obviously working to a concerted plan” has subjected the old dears who man the phones at UKIP HQ to “clearly insane” abuse, and they have passed recordings of the “horrible messages” to the police. Things are so bad that they have had to install a system where all withheld numbers are automatically blocked. Nick Clegg did say he wanted to get more passionate…