The London LOOP - London Outer Orbital Path - is a 1503/4 -mile (242.6km) circuit of the country's capital. It was largely the brainchild of an organisation called the London Walking Forum, which was formed in the early 1990s to encourage people to visit and take advantage of the many green spaces in the capital. They created a walk that followed, roughly, the outskirts of Greater London - and the LOOP was born. The official start is at Erith and...