Crick is alleging that the Tories smashed the spending limits in an effort to defeat Nigel Farage.  It was treated by CCHQ like a by-election.  Even if UKIP prove it, would the Electoral Commission do anything about it? 

UPDATE: A legal source reminds Guido

The South Thanet misspending a not an Electoral Commission matter. It is a police matter and a criminal offence under sections 81, 82 and 84 of the representation of the people act 1983. If only someone could get the police to take it seriously.