Chain of Custody Audit Our Chain of Custody Certifications for FSC & PEFC SECTORS Timber Development UK FSC PEFC STTA Chain of Custody Audit Reduced Impact Logging Fair & Precious Recycled Marine Timber Timber Development UK FSC PEFC STTA Chain of Custody Audit Reduced Impact Logging Fair & Precious Recycled Marine Timber Our Chain of Custody Certifications for FSC & PEFC Interface & CATGGilmour & Aitken Ltd is certified for FSC® with Interface and PEFC with CATG. There is a detailed annual audit on our site to ensure compliance.