International remittance is charged according to the number of times, but not according to the amount in Chinese mainland.
Therefore, the highest handling fee for general international remittance is about $25 per transaction, and the lowest is about 15.
If you are investing in wealth management and speculating in foreign exchange remittance, you'd better choose a well-known platform and agent, so that they can help you check the mistakes and make it easier to deposit and withdraw money. And it is not easy to make mistakes.
If you send money to a private person, you can send money by Western Union. See if British banks have this business. Your family can ask for details in Britain.