The good thing about Surestart is that it wasn't selective, it was also a melting pot of people, who all, on the surface, just had parenting in common. The comments above suggest that some parents don't know what opportunities exist out of their own bubble, so mixing with people from different walks of life is beneficial, it also helps promote racial integration and understanding the experiences of parents whose children have additional needs. It also means you don't have to declare yourself as "officially struggling", which would rule out anyone wary of seeking professional help or who felt their needs weren't enough to warrant it.
Also being middle class doesn't mean you are not struggling, abused, parenting badly, have lots of support etc. I'm firmly working class, DH middle class, we had no spare cash but lived in
what was deemed a nicer area. I had PND and some days I struggled to get off the couch, but a local group (not actually Surestart, but the same idea) gave me somewhere to go at the suggestion of my HV. I breast fed for two years because of the intial support I had there. Should I not have benefitted because I was seen to have more?