During his visit Prince Charles also saw the complementary therapy suite where massages are offered.

BBC: The Prince of Wales and Joseph Black

During his visit he spent time at the complementary therapy unit where more than 250 children have had massages since it opened in 2010.

BBC: The Prince of Wales and Joseph Black

"The finding here suggests acupuncture may be useful as a complementary therapy for people who are already on standard treatments, but not getting full relief, " he told the BBC News website.

BBC: NEWS | Health | Acupuncture 'works for arthritis'