www.aphc.co.uk Association of Plumbing and Heating Contractors (APHC) www.logiccertification.com Logic Certification UKAS Accredited, Renewable Energy Certification, Energy Efficiency www.trustcorgi.com Council of Registered Gas Installers (Corgi) www.iphe.org.uk Institute of Plumbing (IOP) www.thegmcgroup.com Guild of Master Craftsmen (GMC) www.builders.org.uk National Federation of Builders www.snipef.org Scottish & Northern Ireland Plumbing Employers Federation www.hvca.org.uk Heating and Ventilating Contractors Association |