Cashback never seems to track properly
The ferry service is OK, though I'd bring a packed breakfast rather than be charged ten quid for a half-cold fryup. Facilities at the Dunkirk end could be a bit better — everything is vending machines, and despite signs saying there is a change machine, there doesn't seem to be one.
Annoyingly, there doesn't seem to be a marketing opt-out tick box anywhere in the user journey, meaning you have to email customer services to opt out. They then don't reply to this email, so you have to hope they won't spam you. Frankly, this sort of implicit opt-in should be outlawed — no marketing without EXPLICIT opt-in permission!
Probably the most annoying part from a Quidco user's point of view is that I've travelled three times now, and had to raise a claim to get the cashback to track EACH time. I don't know why this has to be so hard...