I've booked a ferry from Rosyth (Edinburgh) to Zebrugge on the 20th June and I'll be heading down to the south of France. I'm going by myself with a tent, leathers, helmet and some sun cream.
Don't worry about doing it alone, you're likely to meet other folk on bikes in any campsite you stop at. Or you can bring a spare helmet and convice a fit French bird to ride pillion with you!