The couple visited Reprezent 107.3 FM in London on Tuesday.
The purchase includes 27 stores, which will continue to trade under the Marks & Spencer name.
Clothing sales were broadly flat, but full-price sales grew 5.3 percent as the retailer seeks to upgrade.
Clothing and home sales were down 0.5 percent in the three months to July 1.
Europe’s major markets were up in mid-morning trading after Britain’s inconclusive election.