For a short time I felt a ridiculous sense of achievement: I'd finally tracked down the text of something I'd once seen being performed by Harry Secombe (90% sure it was him, anyway) on a BBC archive clip. The sketch consisted of him explaining that there's no such work as Paradise Lost, based on the assertion that none of us knows anyone who's read the whole thing. (I suspect a fair few of you would disprove that, but it was funny.) The Daily Mail (so it's good for something...)
supplied the context that it had been written by Bernard Levin for Ned Sherrin's That Was The Week That Was, and I actually thought that I'd found the full text
on the website of a literary magazine, The Foliate Oak, except that their poem on the subject (which I like very much) is credited to Mark J. Mitchell, and doesn't contain the quote that the DM article included.
Despite a YouTube search, the sketch 'There Is No Such Book As Paradise Lost' remains elusive...