In short, they're not. Nobody has them on prescription yet (edit 03/11/17 - almost nobody - there is some evidence that a few people might have them, but yet to be totally convinced). There are a small number that have persuaded their doctor/specialist to fund, but it's difficult to know exact circumstances and it hasn't been done in a coherent way. The situation became different from 1st November, in that it is now possible to prescribe the Libre. However, the budgets are controlled by the local health authority (CCG) and ultimately they decide whether to fund or not and who to fund it for. There could be a chance that a GP/Specialist could go 'maverick' and prescribe without authority...but like current funding, will be rare and not coherently managed. The problem the CCG have is two-fold. Firstly, budgets run from April to April. Starting funding in November means that they'll have to find extra cash from somewhere to fund the Libre - at least initially...
T1 Diabetic ramblings, with a special interest in the Abbott Freestyle Libre Glucose Monitor...and perhaps some totally unrelated musical thoughts.