A narrative has developed in recent years that London is losing out to international exchanges on prized floats on the back of Brexit and the resulting turmoil in just about every aspect of the business landscape.

What started with failing to secure Aramco in 2019 has turned into a flood of departures more recently, including Arm, CRH, Flutter and Ferguson. Household names Shell and Revolut have also talked up the benefits of listing abroad.

Despite...