He became a British citizen in 1961. After Winsome Ward died in 1962, Panufnik and Jessel were drawn increasingly together, and they were married in November 1963. They moved into a house near the Thames in Twickenham, Greater London, where at last Panufnik had the peace to concentrate entirely on composition. His works were in demand by such major figures as Leopold Stokowski, Seiji Ozawa, André Previn and Sir Georg Solti, as well as Yehudi Menuhin who commissioned a violin concerto, and Mstislav Rostropovich who commissioned a cello concerto. He also received 3 commissions from the London Symphony Orchestra and commissions for Centenary symphonies from both Boston and Chicago. The Royal Philharmonic Society commissioned his Ninth Symphony, "Sinfonia di Speranza". Panufnik refused to return to Poland until democracy was restored in 1990. He was knighted by Queen Elizabeth II in 1991. He died in Twickenham, aged 77, and was buried in Richmond Cemetery. His daughter Roxanna (b. 1968), by his second wife Camilla, is also a composer.