8 years too late for me, but I've always wondered if what I was told was right
I successfully BF my DD but finances dictated that i had to go back to work full time when she was 14 weeks old. I told the HV that I planned to feed her in the morning, then express at work and then feed from getting home - so, 8am ish feed, express through day and then BF from 6pm onwards
She told me there was no way I'd be able to do it and to get her onto formula. So I did. I often wonder (now I'm older, wiser and not as "yes HV" as I was) if I could have continued?