Where is the closest ferry port to Bayeux to return to GB?
The three closest routes for ferries to Great Britain are: Caen, Le Havre, Cherbourg. I have no idea which ones run on which schedule or which seasons. Check Direct Ferries website for that information.
Regarding your other post about trains to Bayeux from Southhampton -- We like to sometimes take the ferry from Portsmouth to the port, Quistreham, where a bus meets the ferry and takes you to the Caen railroad station. You can take a train to Bayeux but we prefer to fetch a rental car right across the street from the Caen railroad station and drive to Bayeux, about 15 miles. We've never returned to GB by ferry but they are available daily. You might check out seat61.com for both train and ferry schedules and great advice. Good luck.