On 5th May voters in London, Liverpool and Bristol will decide on a Mayor for their city, but what are the key issues facing those cities? As the campaigns kick into full gear, we’ve asked experts from the worlds of business, housing, local government and academia to set out what they think the big challenges will be for the those elected in 2016. The blog series includes contributions from Tony Travers, Bridget Rosewell, Sir Richard Leese and more coming soon.