The ongoing mystery surrounding Boris’s mistress, her then boyfriend’s £80,000 donation and her subsequent landing of a job as an Olympic fundraiser just got a little more serious for the wayward Mayor.

Boris is now facing an official investigation regarding Helen Macintyre, the mother of his love child and the latest “love of his life”, and why exactly she got her job. The Standard neatly summarises some awkward questions that need answering:

What are the claims Boris faces?

That he has breached several sections of the GLA code of conduct. This states he should never “improperly confer an advantage on any person”, “place yourself in situations where honesty and integrity may be questioned” or make any decision which affects the “financial position of… any person with whom you have a close association”. It also states that he must “make decisions on merit, including making appointments” and “indicate that you have a personal interest” when one arises.

Labour have triggered the investigation and smell blood after Boris’s election promise to end cronyism at City Hall, something that so damaged the last months of Ken’s regime, though it should be borne in mind that the post was unpaid. Still, not sure this one can be dismissed as an “inverted pyramid of piffle”…

UPDATE : Whilst we’re on the subject, Guido has been meaning to mention for some time that Helen Macintyre’s nickname at Edinburgh University – given to her by a boyfriend – was “mini-cheddars”.