I can't answer about the La Sportiva sizing, but you might like to try these
They're on sale until today or tomorrow for AU$90+$9 shipping.
They list a size UK 12, EU 47 in stock. No problem to return, but you won't get shipping refunded! They fit very similar to my Trailroc 255s, wide ish fore foot, low cut heel. I haven't taken them out of the house yet, but the tread looks a little less grippy than the Trailrocs. Having said that, the Trailrocs are amazing, so these should be pretty good.
9mm drop compared to the Wildcats at 12mm. 313g compared to 351g for the Wildcats (not sure what sizes they both weigh though)