"The royal couple toured the cityâ??s Christie Hospital, a specialist cancer hospital which won an award from the Princeâ??s Foundation of Integrated Health in 2003 for its growing complementary therapy service."

"Charles spoke for several minutes to an aromatherapy specialist at the service who is investigating how certain essential oils can lower the risk of infections, including those from superbug MRSA."

"Dr Jacqui Stringer, 44, clinical lead complementary therapist at the hospital, is working with Manchester University to develop a special mix of oils to put in a protective gel wash."

"It is understood Charles asked her what oils she used but she could not reveal them as the research is still at trial stage."

"Instead she gave him a piece of gauze impregnated with the secret formula to take home and smell, challenging him to guess the ingredients."

"Ms Stringer said: â??He was very interested in my work - genuinely so - and his questions were pertinent. Heâ??s very knowledgeable and charming.â??"

"The
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