I had a blood test a few years ago and was waiting for results. I also had an appointment for something unrelated, two days before my appointment I was inundated with calls from the nhs, I ignored them at first as I did not recognise the number, then they rang my mobile, about ten times, in the meantime I tried ringing and just got a recorded message from the nhs. I was terrified that my blood test had found something dire and spent a terrible weekend. At my appointment they confirmed the calls were just to remind me of my appointment,(blood test ok). I immediately removed my numbers from their data base. Prior to this I was unaware they rang to remind people of appointments. this can be so scary especially as they never leave a message.