The Competition and Markets Authority (CMA) has published guidance on its functions after a ‘no deal’ exit.
It explains that the effect of the Withdrawal Act is that, from Exit Day, EU law will be converted to UK law and EU-derived UK law will be maintained.
In the area of consumer protection, the broad effect of the EU Exit legislation is that, immediately after Exit Day, UK businesses and consumers will be largely subject to the same consumer protection laws and benefit from the same rights. The CMA will have the same consumer enforcement powers regarding these domestic transactions.
Further information on the CMA's role after Brexit can be found on the GOV.UK website.
Also see the BVRLA’s Brexit information page.