As its the time of year for thinking of holidays.
The old Portsmouth-Le Harve route was dropped by P and O a couple of years back. This was a shame cos Le Havre is handy for central and sw France. More expensive than Dover Calais but could cut a chunk off your motorway miles.
Its now being run by LD lines:
http://www.ldlines.com/pages/uk/index.html
only once a day but the timings are handy, the outward leg Portsmouth 23:00, gets in to Le Havre at 07:30 ready to hit the roads south after a nights kip on board. Assuming you book a cabin...
Adam.