By DAISY GRAHAM-BROWN, INVESTIGATIVE REPORTER Published: 18:25 EST, 21 February 2026 | Updated: 18:25 EST, 21 February 2026 Andrew Mountbatten-Windsor secretly used an official trade mission to help strike a multi-million-pound deal for his business associates to sell oil to China, emails seen by The Mail on Sunday suggest.The emails expose how Andrew apparently exploited a taxpayer-funded trip to China by working with his top aide to broker deals in the hopes of making 'tons of money' with paedophile Jeffrey Epstein.Andrew and his adviser David Stern, a fixer for both the former prince and Epstein, plotted to do business with…