I have the same addiction to planning trips on my own. If you aren't already aware, presuming there are no transit strikes going on, it's quite easy to get to the QM2 in Southampton by train or bus from many places in England. Alternatively, some people we know have rented a car and dropped it off in Southampton before a cruise. This website has always been helpful for planning our trips to and around London: https://www.londontoolkit.com/
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