A and A Williams offer a range of services including boiler installation, boiler repairs, boiler servicing and Gas Engineer and Plumber in Chorley and surrounding areas. If you have any questions of need some advice please contact us and we will be pleased to assist you. We are Gas Safe Registered Gas Safe Register is the official gas registration body for the United Kingdom, Isle of Man and Guernsey, appointed by the relevant Health and Safety Authority for each area. By law all gas engineers must be on the Gas Safe Register. Gas Safe Register replaced CORGI as the gas registration body in Great Britain and Isle of Man on 1 April 2009 and Northern Ireland and Guernsey on 1 April 2010.