Here in America, the spokespersons in the Polaroid blipverts were James Garner and Mariette Hartley. Their spots proved to be so popular that many people assumed they were actually married to each other. (If I'm not mistaken, Ms. Hartley wore a T-shirt while pregnant that bore the legend "NOT JAMES GARNER'S" with an arrow pointing downwards.
Well, over in Great Britain, the Polaroid spokesfolk were married to each other.
At least in Toobworld.....
Richard Briers and my favorite British actress Felicity Kendal never refer to each other by name - at best, she refers to him as "Darling". So it could be that they are appearing as their characters from 'The Good Life' ('Good Neighbors' to us Yanks), Tom and Barbara Good.
Which means that Tom and Barbara were tele-cognizant serlinguists, aware of the fact that they were living in the TV Universe and able to communicate to the audience viewing at home in the Trueniverse (our home dimension of Earth Prime.)