the application and environment type, and stone type which should be kiln dried mixed aggregate incorporating 2-5 mm sizes to ensure that the aggregate gets sufficiently coated and also to meet the standard requirements when tested to BS 8204-6:2008+A1:2010 Appendix B for slip resistance. This ratio is sufficient to install at a minimum depth of 15 mm at a coverage rate of approximately 4.0 m2 and is suitable for pedestrian traffic. For vehicular traffic of up to 7.5 tonnes a minimum of 18 mm is required at a coverage rate of approximately 3.3 m2. Although resin-bound paving is a slip-resistant, SuDS permeable decorative paving system, it has the ability to last for many years if sourced and installed correctly. It is good practice to source a FeRFA associated member. Natural aggregate mix blends tested to BS 8204-6:2008+A1:2010 Appendix B for slip resistance will, when installed correctly, provide a slip-resistant, permeable, decorative finish suitable for pedestrian and light vehicular traffic. Decorative coloured recycled crushed glass and pigmented quartzes are suitable generally for visual purposes only, as they are susceptible to damage due to having low crush values, and so will become damaged if walked on. Natural aggregate and recycled rubber blends are available from UKAS ISO9001 manufacturers and are suitable for pathways and nature walks where environmental benefits are required from the specifier. The resins available should be UV resistant polyurethanes. The usage of higher-quality UV polyurethane resins ensures greater flexural performance for external applications and the resin will not yellow (non UV aromatic) in appearance when exposed to UV light, the presence also provides greater protection from UV degradation. Non light-stable polyurethanes, although marketed as strong in performance, they will rabidly dis-colour and degrade and are only suited to internal applications where they are not in direct sunlight. Internal resin-bound applications are generally known as stone carpet. Resin-bound systems incorporating 6-10mm dried aggregates and larger sizes are generally used as tree surrounds known as tree pits. These are a cost-effective and practical alternative to metal tree grilles that are stolen for scrap value, are costly to purchase and harbour litter thus increasing maintenance costs for local authorities and tax payers. Tree pit systems work in a similar way to UV resin-bound surfacing systems only using larger aggregates to allow more water to permeate through to feed the trees they surround. Tree pit systems are generally installed at a depth of