Five Star Babies: Inside the Portland Hospital won’t, I suspect, have been a hard sell to BBC2’s commissioning editors. Childbirth and rich people are both reliably popular subjects for TV documentaries. So why not combine them into one handy package by showing us life at the UK’s only private maternity hospital? And yet, however artificial the programme’s conception, any sociologists studying contemporary Britain’s peculiar attitudes to the very wealthy could have done a lot worse than to tune in to Wednesday’s episode.