www.itdd.co.uk : Digital Design IT Support Services - Provide outsourced IT Support to companies within the U.K.
www.robustdetails.com : Robust Details Limited (RDL) provides a route to compliance for Part E of the Building Regulations (England and Wales).
www.attma.org : The Air Tightness Testing and Measurement Association
www.isomass.co.uk : Isomass Ltd supplies acoustic soundproof systems accepted under Approved Document E of the Building Regulations