UK registrations of 4x4 vehicles tumbled by more than 18 per cent last month in a powerful sign that Europeans are joining the headlong scramble out of large gas-guzzlers seen in the US. The data from Europe's second largest car market mirrors collapses in largevehicle sales under way in other European countries, and comes as petrol prices touch new highs and consumers delay big purchases. Tighter household budgets and smaller City bonuses are also hitting sales of specialist sports cars, which dropped by nearly 15 per cent in Britain last month, according to the Society of Motor Manufacturers and Traders. "People are just holding off, and nobody is buying a