In Duffy's collection 'Mean Time' and Larkins 'The Whitsun Weddings', both poems explore how 'Time ruthlessly destroys what we hold precious in life, offering nothing in return'.
In Larkin's poem 'Afternoons', he focuses the reader's attention to the inevitable force of time that takes away precious moments, instead of time being a destructive and 'ruthless' force.
Duffy uses her poem 'Mean Time' to portray time as a villainous force which 'offers nothing return'.
Both 'Pluto' and 'Home is so sad' present the same sense of loss and perhaps this emptiness that lingers after grieving the past, knowing that it's no longer present.