I know where I live it’s that certain HV have certain areas of that catchment and that’s how it’s worked. It’s the same where I used to live too. However, in bigger places I’m not sure if they’ll have more than one HV per catchment and it’ll be whoever has space x
Ask for a different one
Yes you should have a HV assigned to you. That’s really not great that she’s not coming back to you, my HV is brill at coming back if she’s not available at the time. She did give me a leaflet which had a number that she told me to call if she wasn’t available and I wanted an answer ASAP. Not sure if it’s just relevant to Northern Ireland though- I have my little boy sleeping on me at the moment but can see if I can find it once I’m free 😊