Passage from A.E. Housman's More Poems cited by Alan Bennett at dedication of Housman memorial, London, 17 Sept 1996

Shake hands, we shall never be friends, all's over;
I only vex you the more I try.
All's wrong that ever I've done or said,
And nought to help it in this dull head:
Shake hands. here's luck, good-bye.

But if you come to a road where danger
Or guilt or anger or shame's to share,
Be good to the lad that loves you true
And the soul that was born to die for you,
And whistle and I'll be there.