I don't think it's either/or maddyfour.
I guess I have a personal interest, as I am forever being monitored, which must cost the NHS money.
1 I've had T2 diabetes for over 30 years and am now suffering for it, as I have painful neuropathy, tendonitis (for which diabetes is a risk factor), the first signs of retinopathy (for which I have more frequent eye tests) and problems with my feet. I have HbA1c tests every three months, but they only give an average. It would be helpful if my sugar spikes could be identified earlier. I know they happen when I have any kind of infection or I'm particularly stressed and can't sleep. I use finger prick tests, but they are a little painful and most of the time, I'm OK. It would be helpful to have continuous monitoring, so that I really can highlight the problem times and do something about them.
2 I've had a heart attack. Although I've had three echocardiograms and a number of ECGs, which show that my heart is in reasonable shape, there are times when I have worrying symptoms (fast heart rate and breathlessness). I usually ignore them because they don't last long. My blood pressure is usually normal (I take medication), but sometimes is very low. It might be helpful if an accurate record of the fluctuations were available.
3 I've had lobular breast cancer and am constantly aware that there could be recurrences. Lobular breast cancer isn't always picked up by mammograms, but is picked up by MRI scans.
4 I currently have a suspected melanoma, which has been identified by scanning but needs to be confirmed and treated with a biopsy. The current average waiting time for dermatology at my local hospital is 26 weeks, as there is a shortage of dermatologists.
As a result of the above, I would be happy to wear a smart monitor, but I would also like to see an increase in the number of MRI scanners and staff. All this costs money, of course, but could save money in the long run if fewer tests were needed. If the melanoma is confirmed and needs treatment at a more advanced stage, it will cost the NHS more than if it's identified and treated now.
I'll be following the results of any trials, which I welcome.