Hi, and welcome - it might help people to reply to you if you supplied some details - do you have diabetes, and if so, what type; what your A1cs look like; whether you're on medication or not, and if so what; what your lifestyle is like - do you low carb, or keto, or something else.
All of those might have a bearing on whether you might be prescribed a CGM via the NHS. Have you discussed a CGM with your doctor?