I imagine you've seen the 1911 census? everything matches, Joseph Havelock a marine engineer born Newport, Mon, but he's in Greenwich with his wife of 16 years Ruth (Goldsmith), it says children of this marriage 1, children living 0. they married in London in 1899 so their arithmetic is a bit out, unless they included years where they co-habited. Their marriage is the only Joseph Havelock Morgan marriage I can find, but there are Joseph H marriages.
Hope I haven't given you more problems? I couldn't find them in 1901 either.