Definitely. Keep asking for the referral. If you're T1 you could be still producing some insulin for on average 6 months, which makes the doctors think that the medication alone is working. They need to be sure and not guess. You don't want to be on gliclazide is you're T1 as it will quickly kill off your remaining beta cells and make insulin more difficult to manage.
Here is the referral pathway you can discuss with them:
'Diagnostic criteria for Type 1 diabetes • Diagnose Type 1 diabetes on clinical grounds in adults presenting with hyperglycaemia (random plasma glucose more than 11 mmol/L), bearing in mind that adults with type 1 diabetes typically (but not always) have one or more of the following: ⁻ Ketosis ⁻ Rapid weight loss ⁻ Age of onset < 50 years. / BMI <25 kg/m2. ⁻ Personal and/or family history of autoimmune disease'
Take this pdf along:
https://www.england.nhs.uk/rightcar...40/2018/07/nhs-rightcare-pathway-diabetes.pdf