Iceland Ferry
Might be talking out of turn, but my understanding is that it will be sailing from Scrabster, direct to Seyisfjodur, Iceland. But getting back is gonna be a bit long winded, because i think you will have to go to Faroes, (which is worth a visit, just pray for sunshine.) then it heads to Denmark, then back to Scrabster.
This year we spent 3 days in the Faroes on top of our Iceland trip, then sailed back to Scrabster, so the new route could add extra days to the return sailing.
I paid £200 for a couchette, bike & me this year, a couple of mates of mine, paid about 80% more for a cabin i think.
Email Smyril or ring them, they where very helpful and speak really good english, i always prefer to talk as opposed to email