With Brexit complete, MiFID firms must deal with two important implications: separate FCA reporting and treatment of the special class of instruments.
Separate FCA reporting
There are now two kinds of MiFID investment firms, each with different reporting requirements.
Prior to Brexit, UK and EU entities were both governed by guidelines established by the European Securities and Markets Authority (ESMA). Now, however, investment firms operating in the EU need to report securities to ESMA, while firms operating in the UK will report trades to FCA