Brittany do Portsmouth to St. Malo. Leaves Portsmouth at 8pm and arrives at St. Malo at 8am. Great service but a lot more exepensive that the Transmarche.
Good link that one Rob. Interesting that they say LD lines are expensive though, they are the one from Charlottes link who operate P&O's old boat, £81 as apposed to £180 for Brittany.