If you want to do maritime law, go to Southampton.
I would make sure it is something you're actually interested in pursuing, as it's a weird area and certainly not for everyone. Law and Sea is a good site, by some Greek LLM, and gives a good overview of bill of lading and charter-party contracts.
City is a good maritime school; was better when it had Dockray. It is generally average as a law school. Southampton is a more solid school and has all of the best maritime academics.