BR▸ did come out with some pretty good adverts.
Shown Christmas Day 1988 - an adaptation of Night Mail by W.H. Auden (they kept the first verse and changed the next two)
The Auden poem was written for the famous 25 minute 1936
GPO‡ Film Unit documentary, also called "Night Mail", which had specially composed music by Benjamin Britten. I haven't been able to find a web version of the original.
Apparently they sat Auden down and made him "cut and paste" the poem until it fitted the film sequence.
You can hear the steam engine rhythm if you read it aloud.
Try this bit of the original at the gallop.
Letters of thanks, letters from banks,
Letters of joy from the girl and the boy,
Receipted bills and invitations
To inspect new stock or visit relations,
And applications for situations
And timid lovers' declarations
And gossip, gossip from all the nations,
News circumstantial, news financial,
Letters with holiday snaps to enlarge in,
Letters with faces scrawled in the margin,
Letters from uncles, cousins, and aunts,
Letters to Scotland from the South of France,
Letters of condolence to Highlands and Lowlands
Notes from overseas to Hebrides
Written on paper of every hue,
The pink, the violet, the white and the blue,
The chatty, the catty, the boring, adoring,
The cold and official and the heart's outpouring,
Clever, stupid, short and long,
The typed and the printed and the spelt all wrong.