Ferrysavers are offering 10% off various LD lines for next summer, including Portsmouth to LeHavre. To the end of November. I got it in a mass mail: here's the link:
http://www.ferrysavers.co.uk/eshots/Nov2009/Nov2009LD.htm?utm_source=email_2009_11_Nov_LDsolus_offers&utm_medium=Email_Newsletter&utm_term=Nov_LDsolus_offers&utm_content=email_engine&utm_campaign=email_2009_11_Nov_LDsolus_offers
Just booked for Aug next year - about £200 less than Brittany ferries.
http://www.ferrysavers.co.uk/eshots/Nov2009/Nov2009LD.htm?utm_source=email_2009_11_Nov_LDsolus_offers&utm_medium=Email_Newsletter&utm_term=Nov_LDsolus_offers&utm_content=email_engine&utm_campaign=email_2009_11_Nov_LDsolus_offers
Just booked for Aug next year - about £200 less than Brittany ferries.