We were having a fine day out. Having just finished off hours of fun in the woods and a pub garden playground we were heading back to the car. Tilly was wanting to be swung between us. We were just about there when we did a last unsynchronised lift when ‘click’ went Tilly’s arm. She started crying, a lot. In a trice our plans for the rest of the day were swept aside and unbeknowst to Tilly, she was about to visit the hospital.