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The museum, in Jogjakarta, Java, said it had only wanted to educate.

A family spokesman said Puan Sri Siti Amirah, the step-grandmother of Datuk Seri Najib Razak, was travelling alone on her way back to Jogjakarta, Indonesia, from Amsterdam.

In her book, Jane-Beers writes of a traditional healer in the city of Jogjakarta who apparently cured what had been diagnosed as a terminal case of cervical cancer with a tea made of betel nut, Madagascar Prewinkle and mysterious 'benala' leaves.

Former 3i executive Thornton, who attended an intensive Bahasa Indonesia language course in Jogjakarta in central Java late last year, said he is considering setting up a “special opportunities” fund that would make private-equity investments, buy shares of listed companies and high interest-paying debt.

Located 30 miles from the Javanese city of Jogjakarta, Borobudur is eventually expected to attract several million visitors a year.