There could be another reason he is joining ukip,he sees his tory seat likely to go to ukip,then decides to jump ship to save his seat,as well as his salary + expenses.Of course i could be totally wrong and he might just be the jolly decent and principled bloke some think he is...

And crafty dave ramping up the terror threat to "Be very,vey afraid" just to keep farage's smug face off the news,genius eh?