In reply to Neil Williams:
That seems quite cheap to PyP, the app says it's £18 for 8 hrs. We tried to book it for yesterday using the app but it just said there were no spaces available so we assumed we were too late and it was full and went elsewhere.
Found plenty of parking over in Ogwen even arriving after 9 although returning at around 3 pm there were cars everywhere, blocking the pavement and even parking where there were solid white lines. No parking wardens it seems as there were no tickets issued.