Type 1 diabetes requires a lot of work to try to keep glucose levels in the target range. Hybrid closed- loop, also known as artificial pancreas, takes glucose readings from a sensor (continuous glucose monitor) and uses an algorithm to tell an insulin pump how much insulin to deliver. Hybrid closed-loop has currently been rolled out to many people with type 1 diabetes in England. We are keen to develop a deeper understanding of the perspective of people living with type 1 diabetes who have choices about which hybrid closed-loop systems fit their needs.

The main purpose of this study is to explore the choices and experiences of people living with type 1 diabetes regarding closed-loop therapy.

This is a cross-sectional online survey study, which involves people with type 1 diabetes who use closed-loop, wait to start closed-loop or considering closed-loop.

The primary objective of the study is to explore the factors driving the choices of people living with type 1 diabetes regarding closed-loop therapy.

The secondary objectives of the study are:

• To understand what treatment satisfaction with closed-loop therapy means to people living with type 1 diabetes
• To understand what additional support is needed for people with type 1 diabetes using closed-loop therapy

Inclusion Criteria:

• Age: ≥18 years (no upper age limit)
• Type 1 diabetes (any duration)
• People who use closed-loop therapy or wait to start closed-loop therapy or considering closed-loop therapy in the future
• Ability to give informed consent

Exclusion Criteria:

• Any other type of diabetes apart from type 1 diabetes

Participants will be approached via their usual University Hospitals of Derby & Burton NHS diabetes care team.