Britain's markets watchdog will review its rules as the country readies to leave the EU, the source of its financial regulation for decades.

"Post-Brexit, we need to consider the future of regulation to ensure the regulatory landscape is fit for the challenge it faces," the Financial Conduct Authority said.

The watchdog's chief executive, Andrew Bailey, said Brexit will be the most immediate challenge its faces. "In order to ensure we are a regulator that continues to serve the public interest, we need to adapt to the ever-changing environment," Bailey said.