The standard is split into two main parts. Part 1 (which is what most people search for) deals with (using strips, grids, or meshes). Part 2 covers soil nailing.
Using reinforced soil is cheaper and more flexible than building massive concrete gravity walls. However, failures can be catastrophic (bulging walls or collapsed slopes). BS 8006-1 provides the safety framework to ensure these structures last 120 years or more. Bs 8006-1 Pdf