Who among the following writers was a Poet Laureate of the UK?

A poet laureate is a poet appointed by a government or organization, who may be asked to compose poems by that appointing body.
Alfred Tennyson was a Poet Laureate of the UK (1850-1892)  for the above mentioned years.
But the other three poets weren’t  Poets Laureate.

Source: poetrysociety.org.uk