I'm chuffed, truly, darling. Thank you and delighted you dropped by!

Thanks for the details on the poem. If you can believe it, I started this way back in the days before Wikipedia, which confirms what you said and elaborates on it. My source was The Oxford Dictionary of Quotations, which only credits the play it was in without giving the title of the poem. The first version is from the screenplay and the second from Oxford. (Books is great but ain't the internets grand!)