Elizabeth Barrett Browning's English publisher of 1844 Poems (which included A Drama of Exile) was Edward Moxon and Co. Her 1844 Poems were published in a two-volume set and, like the American publication, A Drama of Exile was the opening piece. According to Margaret Forster, Moxon "was prepared to print 1.500 copies and halve the profits with her" (128). A copy of the two-volume set is held at the British Library (which is where the included picture is from). 

https://www.bl.uk/collection-items/elizabeth-barrett-brownings-poems-in-two-volumes-1844