In terms of class issues, def a lot more support offered here to those in 'sink' estates than to others. Certainly my friend got offered additional ante-natal classes at her local Surestart, attended their breastfeeding support group in advance of birth, then had support worker call out after birth to help her with breastfeeding and access to free infant massage and baby yoga classes. She found it annoying from another perspective, almost that because of where she lived it was presumed she needed extra support to breastfeed etc, so it felt patronising.
I would have had to access paid private classes to get the same level of guidance. Don't know if that's just NI though but additional support is definitely targeted.
On NCT, don't presume they are better option offered for those with money - very much depends on the teachers which seem to vary greatly - read some of the threads on here about them. Most people use them as a chance to meet other new mums.