With his slicked-back grey-streaked hair, impeccable suits and a penchant for being helicoptered to mountain peaks on luxury skiing holidays, Luis Barcenas is the cool-headed moneyman viewed as the greatest threat to Spain's ruling Popular Party. The 55-year-old former party treasurer also faces multiple corruption probes. But the man whose face is regularly splashed on the nation's front pages and broadcast on its television screens shows few outward signs of worry.