er-certification.com
ER Certification Ltd - All you need to operate Window Energy RatingsER Certification Ltd was set up specifically to operate as an Independent Agency (IA) for the British Fenestration Ratings Council (BFRC). To provide assessments and audits to fabricators and/or installers wishing to offer windows under the BFRC Window Energy Rating (WER) scheme.
http://www.er-certification.com/