Also UK here, I don't remember being taught how to hold a pen. Mine rests on the third knuckle of the ring finger, with the middle fingertip bracing the pen tip

Also UK here, I don't remember being taught how to hold a pen. Mine rests on the third knuckle of the ring finger, with the middle fingertip bracing the pen tip and the index fingertip bracing about a third of the way up. Then the upper part of the pen rests in the crook of the thumb and palm. The thumb-tip rests across part of the index finger and middle finger, providing some stability.