If so, CL:AIRE is seeking views on their Register of Materials as they are considering improving and updating it and would value your input. To this end they have created a very quick and simple questionnaire which can be found at https://goo.gl/46YkYo. The questionannire is structured so that you can provide feedback on the existing register and provide a steer as to what improvements could be made.
There is no doubt that with the volume of construction soils still going to landfill that we could all do better. Having a visibly live, easily accessible and more effective Register of Material with a vibrant network of users could reinforce the work already done by CL:AIRE to encourage the diversion of soils away from landfilling through the Definition of Waste: Code of Practice.