Alan Rickman was filmed reading this poem in the documentary about the Peace One Day movement:
Long War" by Laurie Lee.
Available in Selected Poems by Laurie Lee: Deutsch, 1983.
Also available in these anthologies:
Peace and War edited by Michael Harrison and Christopher Stuart-Clark: Oxford University Press, c1989.1. Poetry by Laurie Lee.
Poets of Our Time edited by F. E. S. Finn: J. Murray, 1965.
writings by Laurie Lee.