By law, only a CORGI registered gas engineer can work on gas appliances, they can only work on those appliances for which they have competence and are registered to do so.  Basically, if you are only registered to work on hot water/heating boilers you can not work on cookers, Radiant heaters (fires), water heaters etc.  We are competent and registered to install, repair and maintain Boilers (for hot water and heating) Cookers, Fires, Water Heaters and Warm Air.  Please feel free to contact us and we will do our best to help and advise.