Boris Johnson wishes 'broom' David Cameron a happy birthday Wishing Mr Cameron a happy birthday, Boris joked: "I was please to see that you called me a blond-haired mop in the papers. If I am a mop, David Cameron, you are a broom - a broom that is clearing up the mess left by the Labour government, and a fantastic job you are doing. I congratulate you and your colleagues George Osborne the dustpan, Michael Gove the J-cloth, William Hague the sponge. It is the historic function of Conservative governments over the last 100 years to be the household implements on the floor of the house, so effective at clearing up after the Labour binge has got out of control. Later in his speech, as he praised Tory-inspired free schools, Mr Johnson told how a London free school was teaching pupils Latin. He paused before continuing: "Where they teach Latin, Prime Minister," he went on. They teach Latin and know how to translate the Magna Carta - which I know you knew anyway. Mr Cameron has been dogged by questions about his relationship with Mr Johnson during broadcast interviews ahead of his own speech to conference tomorrow. He told BBC Radio 4's Today Programme: "We are lucky to have some big and popular figures that can take the Conservative message out across the country. I've always said to Boris: 'You do a brilliant job as mayor, when you finish your job as mayor don't give up on public service, think of other things that you can do, because you've got enormous talent and we should make sure that's for the country'. The Mayor sought to shrug off allegations of disloyalty towards the Conservative leader with a carefully-worded speech which largely avoided the attacks on Government policy which have characterised his public statements in recent weeks. He told delegates he was confident that a solution would be found to the problem of a lack of aviation capacity in the capital - an issue over which he has clashed repeatedly with Mr Cameron, after the Prime Minister put the option of a third runway at Heathrow airport back on the table. Mr Johnson favours a new airport in the Thames estuary. Yesterday, Mr Johnson claimed that the Government had abandoned the "struggling middle classes," who, he said, were unable to afford to buy homes near their inner city work places. Toning down his attack, the Mayor called for more help for those earning between £30,000 and £64,000, but did not blame the Government for their plight, and said action was being taken to help them in London.