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My only non-obvious tip is to buy a cheap blanket and mask in the Newhaven Co-Op to help you sleep on the ferry. Also, the food on the ferry is decent enough that you only need to get to the terminal one hour before it leaves - I padded the time to ensure I could get some proper food for the next day's cycling, but I needn't have bothered.
I wouldn't have done much differently apart from ensuring I could check into my airbnb earlier - had to hang around for 5 hours before I could have a shower, etc. Maybe another light for L'Avenue Verte? I would also have left London a little later - could have easily done it in 24 hours (as that's a "thing") but ended up hanging around Newhaven for hours.
Needs very little planning and gear btw. I did most of it Friday morning (so many routes online) and even booked my accommodation when I halfway to the ferry..
I did London—Paris—London this weekend, inspired by a few specific posts on this thread but mostly the general feel of just getting out there.
Some pics are available, each one is briefly captioned if you click on it: https://www.facebook.com/media/set/?set=a.10100652651912744.1073741826.61300199&type=1&l=aa1a84cc29
Let me know if you have any questions.