**I believe it is called, rather unsurprisingly, _Death of a Poet_.** Firstly, the poem appeared in an anthology of poetry of his written between 1951 and 1975, and since MacNeice died in 1963, this is the right time frame. The contents of this collection as listed in Google Books includes _Death of a Poet_ which seemed to me a reasonable title.
A search produced this forum page which seems to confirm this and points to the Penguin Anthology _Worlds_ , but I couldn't find this anthology:
> According to the notes in the Penguin anthology 'Worlds', [Causley's 'Death of a Poet']'s about Louis MacNiece _[sic]_.
On the other hand, the Causley Trust also points to this same poem saying
> Death of a Poet also reverberates with MacNeice, not just prescribing his own funeral and pallbearers, a common enough ‘folk’ thing to do, but with Charles’s the parson boomed echoing Louis’s My father made the walls resound/ He wore his collar the wrong way round…