The cheapest way is to get a animas vibe insulin pump and then self fund. Unless you have no hypo awareness you can't get them funded by the NHS. And then only rarely.
Dexcom links with the vibe. There are details around about price.
Type 1 diagnosed 1990
HBa1c current 8.3
Pump and CGM used (animas vibe)
The only way to get a stand alone CGM (not pump incorporated) is by purchasing it yourself.
There's one called the Navigator another made by Medtronic and the 3rd one is the dexcom.
Pumps that incorporate the CGM once you have purchased the sensors and transmitter are the Animas vibe and the Medtronic pump.