If you are going to Wales this summer, which the investiture of H.R.H. Prince Charles has made a popular move, Shell’s splendid Guide to Wales is essential reading. It also contains some excellent colour plates. The authors are Wynford Vaughan-Thomas and Alun Llewellyn and this 360-page, beautifully produced book was deliberately timed for Investiture Year. It is in line with Shell’s Guides to Britain, Scotland and Ireland, and is published by Michael Joseph Ltd., 26, Bloomsbury Street, London, W.C.1, the price being 42s. until August 1st, and 50s. thereafter.