Technical Booklet B Materials and Workmanship·Page 16·2.23
District Council Material Sampling Powers
A district council may take samples of materials used in building work to establish whether the workmanship relating to that material complies with the Building Regulations requirements.
Regulation 16 in Part A allows a district council to take, as it considers necessary, samples of materials to be used in building work, to establish if the adequacy of workmanship relating to the use of that material complies with the relevant requirements of the Building Regulations.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet B - Materials and Workmanship.pdf