This late in the day, your best bet would indeed be to fly into London and buy a package IMO. It costs more, certainly, but the alternative is to spend many anguished hours on t'internet trying to sort ferries, car hire, accommodation; nevermind trying to get tickets from the ebay touts.
It's been a few years since I used the travel package, so I'll leave it to others to advise you on who's best.
Have fun in France.
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