Hi
@spocky1 and welcome to the forum.
I'm a little worried that you're thinking of taking such a big test without medical support. GPs don't provide a proactive service, by and large: if they don't hear from you, they'll assume you're fine. So apart from routine screening tests and flu jabs, you'll not hear from them at all.
While many of us have somewhat tricky relationships with our GPs / DNs, the fact remains that you need to form some kind of working partnership with your healthcare team to keep yourself safe. I'm sorry, but I don't think self-diagnosis (the only reason you'd want a home Hba1c kit, for either yourself or for using on someone else) is wise at all.
Call your surgery. You can book an appointment to talk about diabetes: you don't need a "response" - they'll give you an appointment there and then. If you find you have a particularly rocky relationship with one GP, ask to see another when you book.
I'm sorry. I know each to their own, but if you think that you or someone else in your family has diabetes, you need to see a GP and get that tested, diagnosed and entered onto your health records. You need regular screening and health check ups and, potentially, medication.
Sorry I can't be more supportive.