Potters Bar has a broad range of property ages and styles. The older streets closer to the town centre include properties from the interwar period with heating systems that have been updated over the decades in various ways, sometimes resulting in a mix of old and new pipework and controls. The newer estates and executive homes further out tend to have more modern systems, though even these can be approaching the age at which boilers need replacement or systems benefit from a power flush. We are also familiar with the rural properties on the fringes of Potters Bar, towards Northaw, Cuffley and Brookmans Park, where older cottages and converted farm buildings can present more unusual heating configurations.