Upvote:1
So I went on the ferry without telling them about the name mistake.
P&O didn't care in the end, they didn't even question it. Not sure if that was their mistake or it's procedure for shortened names. We went as a big group so they didn't really look hard at passports, I was the one at the front sorting out the check-in though so they looked at mine more than anyone else's. My boarding ticket just said my first name initial and last name, which is the same initial as my name shortened.
If the name is completely wrong its a £15 fee to change at check-in.
Seems there's no official procedure so if there's a name mistake probably best to check with the operator before your trip.