doughnuting
n.— «Minutes before Mr Cameron stood up at PMQs, an aide, the MP Nadine Dorries, appeared with a carefully created seating plan which would place women MPs all around him for the ideal television shot—a technique known as “doughnuting.”» —“After 13 years, the Tories see higher ground” by Patrick Hennessy Telegraph (U.K.) Dec. 11, 2005. (source: Double-Tongued Dictionary)
I first heard this term around 1989 when they started showing parliament on TV. That was the first time the public could see how many people were in the house (as opposed to just hear the audio). There should be citations from around this time somewhere.