Boris wields a mallet as he prepares to lay paving stone

The Mayor of London prepares to lay the last paving stone at King's Cross Square. Credit: PA Wire

Boris Johnson donned high visibility clothing and a hard helmet as he wielded a mallet to lay down one of the last paving stone in the capital's newest public space.

The 75,000 sq ft King's Cross square, with improved entrances to the London underground, double the number of trees, and an area dedicated to public art, will open to the public on September 26, as the final part of a £550 million redevelopment of King's Cross station.

The 75,000 sq ft King's Cross squar will open on September 26. Credit: PA Wire