I used to work inthe housing department of a Council which, although it had a severe shortage, was awash with two bed houses so it didn't give single occupiers 'underoccupier' points to move them higher up the list, but it did if they were in a three bed house. If your Council does the same, it means he is competing with a lot of other single people without much extra priority. Single properties can be trickier for lots of reasons - lots of people on the homelessness or priority list, people wanting to transfer from their first flat that they don't like to one that they do after years of waiting, blocks that need a certain profile tenant due to the nature of other tenants in the block... etc. If he wants an honest answer of why he isn't getting anywhere he should call the Housing team and ask them - they can give him an idea of how far sown the shortlists he's been coming and so on.