London stock brick is the most commonly used type of building brick used in London. A brick is a block of Ceramic material used in Masonry construction laid using mortar. London ( ˈlʌndən is the capital and largest urban area in the United Kingdom. Its distinctive colour and soft appearance comes from the yellow clay the bricks are made from, which is found in Kent. Clay is a naturally occurring material composed primarily of fine-grained Minerals which show plasticity through a variable range of Water content, and KENT (1400 AM) is a Radio station broadcasting a Adult Standards/MOR format In the London atmosphere they weather down to a greyish black colour but are often cleaned up, returning them to their attractive appearance. The bricks are used both structurally or as decoration. Reclaimed London bricks are fairly sought after for decorative and conservational use.