transportation from honfluer, france to london england

You could take a ferry from Le Havre to Portsmouth

http://www.brittany-ferries.co.uk/ferry-routes/ferries-france/portsmouth-le-havre

then a train from Portsmouth to London

http://www.nationalrail.co.uk/

Or you could take a train from Le Havre to Paris
https://www.sncf.com/fr

then the Eurostar from Paris to London

https://www.eurostar.com/uk-en/