I'm not doing the competition myself but a quick scan through the text suggests strongly to me that the poet must be Dylan Thomas, due to the 'Bible-black' reference (which is clearly from 'Under Milk Wood').
A look at Wikipedia mentions several places where he lived during the second world war
https://en.wikipedia.org/wiki/Dylan_Thomas#Wartime,_1939%E2%80%931945
including New Quay in Cardiganshire, in 'a wood and asbestos bungalow on the cliffs overlooking Cardigan Bay'.
Googling 'Dolphins in Wales' finds this on the Visit Wales website:
"Britain's biggest resident population of dolphins lives in Cardigan Bay".
I've not gone any further, and I might be barking at a red herring up a wrong tree, but I'll offer those thoughts as a starting point to you anyway ;-)