
GillianClarke mentions 9/11 in the Q&A about this poem on her website, and there is something dreadful about the idea of mobiles still ringing after their owners are dead.
There is a useful analysis of the poem here.
When answering a question about this poem, I wouldn't spend too much time on 9/11, but if you make a reference to Clarke's own comment on her site, and share your own thoughts on the way mobile phones are used, you will be working towards an A/A* grade because you are showing that you are making connections, and setting the poem in a social context.
If I were going to compare this to one of the pre 1914 poems, I might compare it to On My First Sonne as it deals with mortality, and with love of family. Any other ideas? Which Seamus Heaney poem could you use as contrast to this?