In September 2019 the British Ancient and Sacred Trees Facebook page discussed yew (Taxus baccata).  According to one contributor:

In the Oswestry [Shropshire] they [knights-of-the-road/tramps] enjoy sleeping under yew because they give off a ‘vapour’ that gives a really good night’ sleep … [I have seen regular ‘knights’ sleeping  under the grand and ancient yew in Dolwyddelen church[yard].

And an Oxford contributor noted:

Have never known a cemetery without a yew tree, as it is a warm place for  homeless people to sleep under.

Image:  Brompton Cemetery, London Borough of Kensington and Chelsea, September 2019.