FROM AN EMAIL THEY JUST SENT THE PRICE IS MEANT TO BE £19 AND NOT £9.
I received an email from Norfolk Line, and it showed offers from £19.
When you go in to book a weekday crossing - there are generally two a day at £9 (which would then have the £2 fuel surcharge added).
So stock up with booze and fags for Christmas without paying punishing UK duty levels. Fill your car with fuel in Belgium for a big saving too. In fact most things there are cheaper, so why not bring back Christmas dinner too.
The price will not appear until you pick the days to travel (weekdays) and then you will see the £9 option(s).
This is NOT an offer for a return on the same day - you can spread it over as many days as you can find a ticket back marked at £9.