company offering forex, gold, financial trading product require to obtain license from financial regulator, the license can be cross check with financial authority website. if broker company operate without verifiable license number, most likely it is fake trading, and your trade doesnt pass to the real market exchange. the money is gone for good as soon as you send the deposit
The correct answer is that the .co.uk and .com are closely related, but there are some differences.
Go to the .com address from outside the UK (maybe even the EU) and you will find that TIO is registered with the SVG FSA, which does not regulate forex.
Before opening an account, make SURE you know if your account will be regulated by he UK FCA or the SVG FSA. If you have a problem with the broker in the future, the UK might do something about it. SVG won't.