The odds of you having a leand lease carbine are very small indeed. There once was a company called Interarms that had warehouses in the London area full of just about every military rifle ever made. They also had buildings in Virginia and would import firearms from the UKicon all the time. The law in the UK is that if a firearm is to leave the country it must be proof fired before it leaves and be so marked just like your carbine. Interarms imported many thousands of carbines into the country before 1968 when the importers information had to be stamped on the firearm.