Here are some useful links:BM TradaPEFCITWCPCambridgeshire CouncilWisbech Town CouncilRoad Haulage AssociationRoof Truss WikikayFlowEggerSwishStructural Timber MagazineFederation of Master BuildersUK AS CertificationCullenGang Nail SoftwareSpace JoistSpace RafterITW