What would have happened if Germany had invaded Britain during the Second World War? General Sir Edmund Ironside was charged with overseeing the creation of defensive lines across the south of England to prevent invading forces reaching the capital. Pillboxes, anti-tank fortifications and military camps were built at a frantic pace during the summer of 1940. They became operational just once in September that year.
Many of these defences can still be found across Surrey around Mole Valley, Dorking and Reigate. Below are a series of photos by archaeologist Chris Shepheard.