Ignore all those other suggestions, they haven’t a clue sure most of them are from Russia.
If you don’t want to get lost follow these directions, I should know I live here.
Take the M50 off the M1 and continue all the way on the M50 to exit 16.
Continue straight all the way until you come to a bloody big round-a-bout (about 1.5 miles) and take the second exit. (Graduate pub will be in front of you)
Continue down until the next round-a-bout and take the third exit. Go all the way to the bottom of the road and the sea will be in front out you turn left and you’ll see the Ferry Port.
Simples