aragon, if it helps, the gp also told me he'd had to sack that HV.
My other favourite bf + medical professional story: a friend of mine was told, at her 6-week check, by the GP (at my practice! which is a good practice, generally, other than the evil HV who hates BF), that her babies head was growing disproportionately large, compared to his body, and she should give formula. This opinion was backed up by the HV.
Luckily, she figured, if something that weird was happening, shouldn't she be seeing a paed and generally freaking out?
(Also, if your baby's head isn't growing fast enough, and you're giving formula, do they make you stop?)