Engaging with patients will reduce the DNA rate. This can be performed by sending reminders either via txt, email or calling. Ideally an automated referral system should perform this task.
Another way would be to allow patients to re-book their appointment on-line and allow other patients to take your cancellation. This way, patients wanting to see the GP urgently have a chance to pick up a cancelled appointment and not go to A&E, saving £80 in cost to the trust.