It was a simple mistake that should not have happened. The route was longer than it appeared, we had cut 10m off the rope to remove a worn area. We had climbed a lot on the crag and were experienced climbers. My belayer was using a new belay device that she was struggling with a bit and there was no knot in the end of the rope. We normally check it but it was missed. Lowered off the end of the rope fell 10 to 15 m onto rocks. Apparently I flipped at the last moment and landed head first. I don't think I free fell the whole distance the bottom of the route slabs out a bit, so would have slowed me down a bit. Damage done six broken ribs and three hairline cracks in my lumber vertebra. Unconscious for a few seconds. Cut to my head where the helmet cracked. Airlifted to a hospital in Alicante where I spent three days in intensive care and another six days on a general ward. I am six month later climbing but the incident set me back. I am getting my climbing head back but it is taking time to get over the mental hurdles. Physically I am surprised at how well I have healed with my ribs causing little pain and only slight stiffness in my back.