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the ferry crossing lasts 4h30min roughly, so in my opinion, not worth paying for a cabin. you can get plenty of sleep/rest in the seats.
You say that, then a bunch of fat bastards in motorbike leathers come in and don't stfu all night.
The cabins are great, you get proper lay-down sleep and there is a decent shower and place to safely leave your gear.
If you travel on the morning ferry this isn't such an issue.
the ferry crossing lasts 4h30min roughly, so in my opinion, not worth paying for a cabin. you can get plenty of sleep/rest in the seats.
also you will find a great deal of people of all sorts doing the crossing by bike and it's just nice to hang out.
Instead of going to brighton, i would do london > newhaven via Ashdown forest and Lewes which i find a nice calmer route.
i think you plan is cool on the french side, re- Mack's route earlier. though if i were to do the return journey, i would do one of the legs in one go :https://www.strava.com/activities/196571748