LONDON, March 22 — British Prime Minister Rishi Sunak today waded into a row over a new England football shirt sold by Nike that changes the colours of the St George’s Cross, saying “we shouldn’t mess” with national flags.

The US sportswear firm revealed it had altered the cross, the flag of England, using purple and blue horizontal stripes in what it called a “playful update” ahead of Euro 2024, which starts in June.