Insulin can be delivered in different ways. By switching away from pre-filled pens you can reduce the amount of plastic used and the carbon footprint of your medication. It might also be possible to save the NHS some money.
If you are keen to switch between one of the above options then you should discuss this with your nurse at your next annual Diabetes review.
There are issues with supply problems with some pre-filled pens. You may have to switch to using a re-usable pen. The video bellow shows how to use a Novopen 5. The Novopen 6 which you may be issued is very similar just with the addition of Bluetooth compatibility. It is really important to do an "air-shot" before each injection. This fills the needle with insulin and ensures insulin is flowing. You may find you need to do a significantly larger "air-shot" when you first load a new cartridge.