THE new edition of The Good Retreat Guide (Rider, pounds 11.99) by Stafford Whiteaker lists more than 300 places 'to find peace and spiritual renewal in Britain, Ireland, France and Spain'. The guide explains the difference between Christian, Buddhist, Hindu, yoga and New Age centres - and also describes the different sorts of retreat available: for example, the Open Door (where visitors can simply walk in), the Healing, the Contemplative and the Group, as well as retreats that cater for individuals.