I note that among Brittany Ferries list of routes, they already have one currently serving Le Havre (X 7 times per week) from Portsmouth in the south of England.
Brittany Ferries also serves Caen (also called Ouistreham) Ferryport to Portsmouth.
Le Havre, located in Normandy on the right bank of the Seine estuary, is the second largest port in France. According to Brittany Ferries website, the ship "Etretat" makes this connection, offering the Eco Class of Brittany Ferries , with also the ship "Baie de Seine".
With most of Ireland's sea connections with France currently using Cherbourg (i.e.) Irish Ferries with it's new "W.B. Yeats" vessel and "mv Epsilon" on Dublin Cherbourg in addition to Stena Line with it's "Stena Horizon" vessel will be operating X 3 times per week on the Rosslare Cherbourg route.
I wonder if it makes sense to have a 3rd ferry operator from Ireland also using the same port of Cherbourg as entry point to France if there are longer inspection checks on freight cargo once the UK transition period after BREXIT takes effect. If road haulage firms face long delays at ports, will improved rail access be sufficient to have more operators operating to/from the same entry point at Cherbourg while other Normandy ports such as Le Havre and Caen are less busy?