An unusual book of walks throughout Britain by one of the contributors to the Sunday Times 'walks' pages.'When we walk, we walk through two landscapes: an exterior land of trees, seas, cities, mountains and fields but we also follow the paths that lead into our own interior world.'     This thoughtful, and beautifully written, book offers 21 circular walks. They span the length and breadth of the British Isles: Suffolk, Northamptonshire, Wiltshire, Wales, Staffordshire, Scotland, Sussex and Cornwall are just a few of the varied landscapes that they cover.     As one of the prime 'walks correspondents' of The Sunday Times, Peter Owen Jones already has a loyal following. This book will only increase his audience, and will be both for those who love walking in the countryside and those who enjoy reading, and musing on it, in their armchair at home.