First of all, I will investigate whether the platform is regulated by FCA and see how well-known this platform is.

Can I withdraw money or not?

So ask a few more why, I think you will have your own answer.

Although spot gold is indeed easier to grasp risks than stocks, it is high-yield after all, so it must be high-risk, and not everyone can make money. Why speculation in foreign exchange and gold is so hot now is because everyone knows that gold investment is a good way and place to hedge and invest. If you are going to invest, I suggest you start with simulation, and don't use real money from the beginning.