Where an Undertaker or Authority wishes to undertake or permit approval trials of Alternative Reinstatement Materials (ARMs) assessment trials may be carried out by formal agreement between an Undertaker and Authority, under an Approval Trial Agreement. The register of these trials is available here:
The SROR also describes a process whereby any local agreement to make use of alternative materials or alternative options for excavation, etc. should be recorded on a central register. This register is available here:
Instructions on how to add entries to the above trials can be found in Advice Note 24 - Material and Trial Registers.