The 'A-side' of Cheltenham's history as a fashionable Regency spa and subsequent reinvention as a town of colleges, churches and festivals is well documented, but what about its 'flip-side'? Much of the town's fascinating history has either been overlooked or lies hidden below the surface. Well-known local author David Elder delves into Cheltenham's lost, forgotten and hidden histories, unearthing fascinating facts and recounting some remarkable stories...