On May, 2019, P&O Ferries sued the British Government over the settlement, claiming that its rival, Eurotunnel, was given a competitive financial advantage, concerning the no-deal Brexit settlement that didn't go as the former company wished.
In the meantime, the British Government cancelled contracts with Britanny Ferries and DFDS to provide extra ferry services after Brexit, which cost the taxpayer more than £50m.
In light of the above, CMA CGM was, allegedly, the largest owner of container ships under the UK flag with 49 vessels.
Specifically, CMA CGM quoted to Reuters that
In light of Brexit and to avoid any uncertainty in the period with our fleet status and regulations ... CMA CGM has decided to transfer its fleet under UK flag to other European countries.
The company continued, that the decision came when it became obvious that the UK flag was excluded from the draft agreement envisaged between the UK and the European Union.
Shipping data present that CMA CGM's UK ships were transferred to the French and Maltese flags on March 1, 2019.
Moreover, a spokesperson for Britain’s Maritime & Coastguard Agency commented to Reuters that
We regret that CMA CGM has chosen to reflag its vessels due to its obligations under EU regulation. It is however, no reflection on the UK Ship Register itself which the company came into originally because of the high quality it represents.
Concluding, official data presented that from May 31 2019 the ships registered in the British flag were 1,229, representing 10.5 million GT (gross tonnage); On the contrary, at the end of May 2018, the vessels registered were 1,315 or 16.5 million GT.