To start: report this online to the National Fraud and Cyber Crime reporting center of the UK as a financial crime here:
Reporting a fraud - Three things you need to know | Action Fraud
Here is the link to file a complaint with the Financial Conduct Authority in the UK:
How to complain - Financial Conduct Authority
Here is the link to the Financial Ombudsman Service in the UK, they may be able to assist in the recovery of your funds, free of charge:
Financial Ombudsman Service: Banking, Insurance & Pensions Ombudsman UK
Also contact your bank and request a trace of the wire to the actual activity where the funds were wired, and then contact that financial entity directly. Keep investigating until you have all the information ready to assist those with the proper authority to adjudicate.
I've filed complaint Financial Ombudsman Service, they just said that they've sent a letter to the company and will wait 8 weeks for their reply. So it basically just means that they would do nothing in 8 weeks. And there's no indication of what they can do if the company does not reply after 8 weeks. It seems the regulatory is not powerful at all.