A few points: HB is not available to anyone who owns or pays a mortgage on their home. It is for renters only. There is a limited amount of help paying solely the interest on your mortgage, for a limited amount of time (6 months?) and that is all that is available to help homeowners with housing costs. So it would appear that absoluteidiot is living up to their name.
Social housing is not just in demand in the south. I don't want to say where I live, but it's not in the south, and waiting lists here are huge. One of my friends was living in one room of her parents' house with her boyfriend and son, they were on the waiting list for a council house (and had been since she got pregnant, it wasn't planned but she was on medication that they didn't tell her would interfere with her contraceptive pill, not that the reasons behind it should make a difference). Anyway, her son was 4 years old and still in that single bedroom with his parents, and they were still on the waiting list, as they weren't actually homeless they weren't a priority. And her parents refused to make them homeless to speed up their application.
I understand that council housing was designed to be housing for life. However, I do want to stamp my foot and say it's unfair, because if you're not in social housing and your circumstances change, you change your housing to accommodate that.
I do agree with whoever made the point about, councils could charge market rates and then provide HB to make up the difference, everyone would agree it was a subsidy then, but as they have missed out the middleman and just reduced rents, apparently it's not.