HVs often (not always!) give advice based on their own anecdotal experience / knowledge / ignorance, rather than based on the latest medical thinking & scientific evidence.
In other words take everything they say with a massive pinch of salt and if it sounds dodgy it probably is!
- Apparently by 12 months all babies sleep through the night
Absolute bollocks. And how dare she make you feel inadequate. She seems to know fuck all about being a parent.
- Also I'm still breastfeeding- apparently I should stop now as its not doing anything for her?
More bollocks. The World Health Organisation recommends all DC (in every country in the world) breastfeed until at least 2 years old. That we generally don't in this country is cultural and fuck all to do with science or what's best for babies or mothers.
The HV is reflecting the cultural norms of this country, not scientific facts or even the medical guidelines she is meant to follow!
The first point about sleeping through is probably related to her weird views about BFing.
My HV told me I shouldn't feed DS to sleep, for no good reason as far as I could tell. (She also made racist comments and recorded us as Asian because I told him my granddad is Estonian. Racist dimwit.)
With DC2 I was really looking forward to seeing the HVs and hearing their idiotic comments about BFing. I didn't complain the first time and I was itching to make up for it and complain the second time!
I was so disappointed then when they signed me off after visiting me all of twice! 
Unless you have a good reason that you haven't mentioned here, you really don't need to see the HV at a year old. She's talking rubbish, tell her you don't want to see her any more, and if you're brave enough (go on!
tell her and her superiors it's because she's undermining your BFing relationship with your child, contrary to the advice of the WHO.