I've done the maths on this, and it's not quite as good as you might think.
Firstly, don't start with the assumption that everyone fingerpricks between 8 and 10 times a day. That's a small minority, sadly.
The average number of fingerpricks done per day by T1s in the UK is a lot lower and the various studies that have been done (this one from 2009 looking at the UK and Denmark:
http://www.sciencedirect.com/science/article/pii/S0168822709001946) suggested that the majority of T1s actually test no more than daily. This report (
http://www.bmj.com/content/319/7202/83) which looked at glucose test strip prescription redemption showed that 16% probably didn't test and 20% didn't go through enough prescriptions to test once daily. This
Swedish study showed that 43.9% of those who responded to the survey said they tested more than 4 times per day meaning 56% didn't. .
Once you take this into account, you realise that whilst getting this technology into the hands of those who want to use it would be brilliant, the bigger question is whether it would change behaviour of users. I've written about that before here:
http://www.diabettech.com/diabetes/...-testing-behaviour-and-the-cost-implications/
In summary, yes this stuff is great, but the costs are much harder to drive out. On a one-to-one basis where a user is already using a lot of SMBG, it makes sense and the costs stack up effectively. Versus someone who doesn't, and who tests less than four times daily, the direct cost comparison argument fails, and due to the behaviour differences, providing them with a Libre doesn't mean that it will change their behaviour. There's much more required than that.
This is why what we really need is a study that takes a number of these people who test really irregularly (say a sample of 250) and give them all Libres for free for six months with appropriate training, and then see where we end up after that period of time. If we see a statistically significant change in behaviour and clinical outcomes, then you can see why the NHS would benefit. If we don't then it's back to the drawing board.