Boris Johnson has been up to his old tricks again this week. The mayor of London has been ticked off by security guards for cycling inside City Hall.

But, for once, it seems BoJo was quick to see the error of his ways. Keen to make amends for his misdemeanour, he "tweeted" an apology to security staff – using the micro-blogging site Twitter.

"Just been told off for cycling inside City Hall. Sorry security!" he wrote.

However, the mayor's tweeting skimmed over his expletive-loaded tirade at Keith Vaz, the Labour chair of the home affairs select committee. Johnson gave a big thumbs up to the Guardian's Dave Hill, who wrote a blogpost wondering what all the fuss was about. "Thank you Dave – top analysis of f-gate," the mayor tweeted.