<B>An England cricket tour is a unique phenomenon, with its own pressures, challenges and remarkable highlights. It presents its participants - shorn of the usual support networks they enjoy at home - with a prolonged test of skill, physical stamina and mental resilience. Now Simon Wilde, author of the acclaimed <I>England: The Biography</I>, examines in <I>The Tour</I> the delicate chemistry that makes for a successful tour and why others disintegrate so badly. </B><BR/> <BR/>Since the 19th century, England has been sending its cricket teams around the world to take on their rivals. Initially, these trips were undertaken by boat, meaning players could be away for many months, often in alien conditions. With air travel reducing journey time and facilities much improved, the challenges still remain: homesickness, isolation, hostile crowds - not to mention an opposition determined to win at all costs. For some, the experience can be too much, while others thrive in