Burnham to say UK must be honest about its challenges as he prepares to become PM

Labour leader will visit king to accept role on Monday and will start making cabinet appointments that afternoon

Andy Burnham will say Britain must be honest about the challenges it faces when he becomes its sixth prime minister in a decade on Monday, as he prepares to introduce measures to ease the cost of living and allow more North Sea fossil fuel drilling.

The Labour leader is expected to start making appointments in the afternoon after going to Buckingham Palace to accept the role of prime minister from the king.