Sadiq Khan has just unveiled his manifesto for the London Mayoral election in May. Spoiler alert: it offers no answers to the mess he has made over the last 8 years. Crime spiralling, road congestion at an all-time high, public transport grinding to a halt and a housing crisis – you do wonder why this year’s manifesto didn’t simply start with an apology. It’s worth noting Khan’s trail of broken promises and complete deviations from previous manifestos before reflecting on this one. For example, promises commuters would not pay a penny more on train fares, that there wouldn’t be a single day of…