It is of use QL !
Medtronic, one of the leading insulin pump manufacturers, has been carrying out clinical trials in America on these for quite some time now. A lot more T1s in the USA are able to have CGMs courtesy of their health insurance (or just their own wealth) than the NHS is willing to fund - some here do either pay for it themselves or if they meet the stringent criteria the NHS generally and/or their own CCG apply - have them.
The same as everything - it's not the initial cost that is too much of a problem, it's the ongoing costs for the 'consumables' - with meters that's the strips, with pumps it's the cannulas, tubing and reservoirs, with CGMs (whether the most super duper or the more humble Libre) it's the sensors that are the drawback whoever is footing the bill.
Hence even if the likes of me or Patti could get hold of the computer gubbins we couldn't use it in the first place unless we also had the CGM - and the likelihood of that happening for virtually every T1 in the UK in my lifetime is Nil, IMHO.