Pardon my pedantry but I really must say this, the word "whomever" is incorrect here as it refers to the person performing the action and not to the object of the sentence. The way to tell is, somebody does something to someone. The person doing the thing is the subject and the person having something done to them is the object. So there should never be a sentence construct such as "...by whomever did something terribly obscene blah blah blah ..." Although there could be a sentence construct something like "...by whomever took it up the bum ..." or something like that. It's a bit tricky, this subject / object business but it's an important distinction and I'd expect better from a Prime Minister. Eh?
Then again, it's not nearly as irritating as Bush's "tuh" ersatz "to". Nine out of ten Texans agree, that's just plain lazy.