* “unseal” – that NDA is not in a court case. It’s not under seal. You mean “publish”.
* “shell companies” – having ur accountant be the registered address is normal. Sorry buddy. The reg address is just where letters go, nothing more.
* “extradition” – I mean, no, this isn’t happening. Do you understand why this happens? It doesn’t happen for investigations. It’s not arrest-level.
* “subpoena” – gona guarantee you now no UK police is going to issue one of these. Not how it works.

You’ev had money stolen from you. File a claim with the small claims court. It’s cheap and straightforward and then you get something you can pursue. City of London police are literally the smallest force in the country and they’re going to do shit. You know this, you know your case is going nowhere, and that serves your purposes.