I think hospitals have to buy in formula. I can check that though (and it may be different in different places, but I think it's governed by the Code).
I have just thought of something else - there are LOADS of threads on here where a woman's been utterly let down by a healthcare professional who is meant to be helping her - they tell them to introduce formula to help with weight gain (weight gain that's perfectly fine anyway), etc, etc - but it can be really hard to say on a thread "you've had really poor advice here" or reference it on another thread and say "this woman had bad advice, look how shit she feels" - but it doesn't mean there are masses of them out there.
Just look at how ill-informed the midwives and paeds were when I had DS2 - a perfectly healthy baby, albeit with blood sugars that didn't rise according to protocol. Had they done some research, they'd have known that bmilk was the best thing for him, they'd have advised me to hand-express (heck, they'd have had facilities for antenatal storage of my colostrum) - but no, less than 24 hours after DS2 was born, I was told I would "have to top him up" - and I said "What with?" because it didn't OCCUR to me that somebody would suggest formula to me on a postnatal ward. I had just given birth, in my defence...!
Then she rolled her eyes and huffed around me, bringing me the USELESS electric breastpump (useless for colostrum, ime) and was deeply unfriendly and disapproving of my refusal of formula.
Luckily, I'm me. I knew enough to know I was doing the right thing. But had DS2 been my first baby, I'm sure I'd have thought that a midwife knew what she was talking about. But no, she'd probably just been reading the Aptimil ads in her latest journal...