Not planned but I ended up coming back on the Hoverspeed one trip. I have crossed the channel on ferry, hydrofoil (pretty much everyone on the boat puked but me) and of course the Chunnel but this trip was the most fun. Too bad it ended, it was worth the 98 quid!
From wikipedia: The Princess Anne (built 1968): built by British Hovercraft Corporation for Seaspeed and stretched in 1977. Transferred to Hoverspeed on creation of the company in 1981. Withdrawn in 2000. Currently at the Hovercraft Museum at HMS Daedalus. https://en.wikipedia.org/wiki/Hoverspeed