My opticians always phones a day or two in advance to remind us about our appointments - which seems to work well. I wonder if the NHS could text or email patients reminders. I know there would be a cost involved but in comparison to the cost of multiple missed appointments.
We have looked into this, and there are issues as many patients see these as "unsolicited" calls, spam mail and complain.
The other issue is (I admit) our own fault.
We have a criteria where appointments must be within ten working days of the form being written. This often means that to meet this a patient will get only 48 or 72 hours notice if the post is slow.
In holiday periods this means higher DNA rates, but if we do not meet these targets that we are penalised.