Shropshire Hills in Nigeria

I am reading Chimamanda Ngozi Adichie's Half a Yellow Sun and the quoted lines appear in the memories of one of the characters:

Into my heart an air that kills
From yon far country blows:
What are those blue remembered hills,
What spires, what farms are those?

That is the land of lost content,
I see it shining plain,
The happy highways where I went
And cannot come again.

I had to look it up it was so lovely and wistful. It's from A.E. Houseman's A Shropshire Lad which according to Wikipedia was in many British mens' pockets when they left to World War I. According to 'Wiki' it has influenced such varied folk as Vaughn Williams, Samuel Barber, Dennis Potter, Allan Bennet, the Simpsons and in a further African connection, in a Chinua Achebe novel 'the main character Obi frequently refers to Housman's poetry'. I suppose I should get to it at some point.