On the credit card claiming front, I read something the other day (possibly on Moneysavingexpert.com or whatever it is called) saying that if what you bought was over £100 but made up of individual things under £100 (like 10 separate crossings) then the CC aren't liable.
Might be worth a little research if this affects you. Luckily although I got a batch of emails from Speedferry (it was never really ferries was it?) I of course didn't actually get my act together enough to book anything, plus our trailer was I think over their length limit so I didn't buy any.