The only danger is if the vehicle is an interferance motor. If the motor is interfearance, the the valves will interfere with the path of the piston if the T-belt breaks. In the US some manufactures stipulate an earlier interval due to extreame hot and cold weather, but it is usually for temps below -40F and over 110F. I would make sure the motor is non interfearance if it is slap a belt only on it and at the 72K service change the water pump, and rollers with it. Newer cars in the us are going 80 - 105k miles, so both those numbers seen early to me. Also their is usually a 30% safety margin so you will be safe extending it to at least 45K I wold think.