With its distinctive shape, large public viewing deck and three floors of sky gardens as well as prime Central London location, 20 Fenchurch Street, a 37-story commercial skyscraper affectionately called 'walkie talkie', was destined to be the pride and joy of the city when completed in 2014. However, a slight design oversight has turned the building into a heat-trapping magnet or as the public now like to call it a 'walkie scorchie'.