A climber suffered serious head injuries after falling 20ft from a mountain in Snowdonia .
Emergency crews were called to Glyder Fawr on Sunday afternoon after the climber fell and knocked himself out while descending from the mountain.
He fell into a gully and had to be airlifted to the Royal Stoke University Hospital - a major trauma centre - as a result of the fall.
Chris Lloyd, from the Ogwen Valley Mountain Rescue team , said the man was with two friends from the London area who had arrived in North Wales for a weekend of rock climbing.
He said: "While walking and scrambling down the descent path, one man took a tumbling fall.
"He sustained serious head injuries and was knocked unconscious."
Mr Lloyd said that one of the man's friends was a doctor and able to provide immediate assistance before more help arrived.
An Ogwen Valley Mountain Rescue Team spokesman added: "The coastguard helicopter, which was already airborne, went direct to scene whilst team members also deployed.
"The winchman and team members were able to stabilise the casualty, package him in a vacmat and stretcher, and then he was flown direct to Stoke trauma centre due to the potential serious nature of his injuries."
