During the trip, the 24-year-old actor brought smiles to seriously ill children and spent time with their families, reported Digital Spy.
The Peckham-born star also took the chance to tour the unit, looking in the Book of Remembrance and turning his hand to a spot of bowling alongside a stormtrooper sidekick.
"I'd heard about the great work of Demelza so couldn't wait to visit and help make some dreams come true. I was blown away by the children and the nurses who do such a fantastic job of caring for them," the "Finn" actor said.
Demelza's Care Coordinator Fiona Ashmore said: "We're so grateful to John for taking time out of his busy schedule to visit Demelza.
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