I saw this film at the 2003 Toronto Film Festival - the ONLY time it's ever been shown in North America - and have been trying to locate a copy of it ever since. Based on my exhaustive efforts and those of the excellent Film Buff store in Toronto, I can categorically state that that there is no available copy to be had anywhere. The only possible reason is that the BBC is deliberately withholding it. And attempting to contact the BBC is futile - they have no customer service to speak of.
My primary reason for wanting this film so badly is that one of the main characters is a neonatologist, and I have a brother-in-law who's one who I know would love to see it. But it's also an excellent film on a difficult subject that any cinephile can appreciate. Kate Ashfield gives one of the strongest performances I've ever seen from an actress - it's like she's trying to WILL her preterm infant to survive. The only stronger actress performance since 2000 that I can think of is Ellen Burstyn in REQUIEM FOR A DREAM.
But you'll have to take my word for it.
Great news! The movie has FINALLY resurfaced after 15 years! Just click "more" in the menu bar on the main page, then click "official sites" and there's a link where you can stream the movie for free. Thank you Vimeo!
p.s. my aforementioned brother-in-law neonatologist saw it, loved it, and says that it's completely legit.