I seem to recall that the Brits standardized on LH twist decades ago. If you notice, the US Model 1917 "Enfields" have LH twist, the reason is that Remington and Winchester first started building the Pattern 14 to Brit specs, set their rifling machines up to match that spec, and didn't bother to go with the 1-10 RH twist that was standard in the 1903 rifles, as an expedient to keep the production lines rolling and put rifles in the Doughboys' hands...
Colts, too, use LH.
Nothing important, I suppose, just seemed odd to see a LH twist barrel from a manufacturer who's obviously been producing RH twist for a long time.
Maybe it WOULD shoot better on the 'bottom' of the planet, where the toilets flush the 'wrong' direction, eh???