Possible Clues:

• Postscript to short poem written by captain, that's outstanding, starting off
• Postscript to a literary work
• Record I record, heard in final programme
• Series finale, maybe?
• Rat runs out beyond rubbish pile in end passage
• Reflective moment which once ended Sundays on the BBC
• Oriental canoe changes hands, that’s the last you hear
• Concluding part
• Coda relative
• Short speech to the audience at the end of a play