Best way to get from Dublin to London without flying?

I'm trying to go from Dublin to London in the next few days. I don't want to fly because my luggage is WAY overweight. Does the ferry to Liverpool still allow foot passengers? That might be a good excuse to go and visit liverpool, then take a bus from there... Any other suggestions? I'm on student... show more I'm trying to go from Dublin to London in the next few days. I don't want to fly because my luggage is WAY overweight. Does the ferry to Liverpool still allow foot passengers? That might be a good excuse to go and visit liverpool, then take a bus from there... Any other suggestions? I'm on student budget so would prefer an inefficient but cheap route:-)
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