I've had mixed expereinces with appointments, I went in May 2007 and they said they would send me another in a years times, it got to May and I hadn't heard anything so rang up the secretary and she booked me one in 3 weeks later and there was a choice of times.
waiting for a podiatory appointment was a nighmare of about 6 months. they sent me an appointment that I couldn't do because i was working and couldn't swap my shift. so I cancelled and asked them to call me to rearrange it, they didn't bother, and my GP had to re-refer me. now i'm waiting for them to make me some insoles, has been 5 weeks when they said it would take 2, have left messages on department answerphone and not heard anything, very frustrating.
being ont he other side DNAs are frustrating, some clincs where i work are going with a one strike you're out policy. whereas I think that's a little harsh, missing 2 appointments isn't acceptable.