In the 1955 Philip Larkin poem "The Importance of Elsewhere", it reads:
Their draughty streets, end-on to hills, the faint
Archaic smell of dockland, like a stable,
The herring-hawker's cry, dwindling, went
To prove me separate, not unworkable.
Living in England has no such excuse:
These are my customs and establishments
It would be much more serious to refuse.
Here no elsewhere underwrites my existence.
Here's a link to the whole twelve-line poem (due to misprinting on the website, the period that should be at the end of the fourth line is missing, but apart from that it is correct).
Some answers and comments to this question have suggested that the poem does not actually imply that in 1955 the streets in Ireland were "end-on to hills" more often than those in England, and refers only to the street he lived on for a few years in Belfast and some other streets in the vicinity, in what could be loosely referred as a sort approximate grid of streets in that part of Belfast, which are oriented end-on to two specific hills in the distance.
I think "my customs and establishments" refers to the customs and establishments of England, which implies that the "streets end-on to hills" are, in this poem, the customs and establishments of the Irish. So these streets are not just the ones in the neighborhood, but of Ireland. If only the neighborhood had been meant, I think Larkin would have written something along the lines of (no pun intended), "My draughty street, end-on to those distant hills,...". Or perhaps, "Those draughty streets, end on to those hills...".
"Their draughty streets" surely means "The draughty streets of Ireland generally".