By Amber Murray The idea of spending tens of thousands of pounds on a luxury watch, such as a Rolex, only to find out that it’s a fake when you take it in for a service is enough to make your stomach turn. But, according to The Watch Register, there’s about a one in ten chance of it happening. Instances of fake watches being checked on the site have increased 116 per cent since last year, the company said. Technological developments have encouraged a boom in high-end counterfeiting, with CNC machines like 3D printers helping to make fakes harder to spot. For mid-range fakes—i.e., good but not …