The opening of the world’s biggest Lego store has been marked with the unveiling of a Big Ben built from the colourful blocks – measuring six-metre high and made of 200,000 bricks.The structure, which took 2,280 hours to build, is the centrepiece of the Danish brand’s new London store which has opened in Leicester Square, and it even features a working clock face which will be illuminated at night.The opening also includes the unveiling of a new Lego mascot named Lester, an English tea-drinking Minifigure, and the first Lego London skyline replica set ahead of its worldwide release in January.