The Financial Conduct Authority from Britain has published alerts concerning two brokers, Ostrich Capital and Olimp Finance.
Ostrich Capital is a Forex broker, meanwhile Olimp Finance is a binary options broker. Both brokers claim that they have offices in London.
As they provide services that need a special authorization from the regulator, the FCA checked them and found out that they are not regulated. Therefore, they are breaking the law.
For your trading use regulated brokers only.