The scheme was actually ment as a shared ownership scheme for key workers (police, nurses, paramedics, health workers, teachers etc...), not just for renting. My partner signed up for the scheme at the start of 2003 and got her key worker flat in 2004 in not-so-nice Greenford. She purchased 50% of the property with the government funding the other 50%. When she sold it in 2006, she sold her 50% to another key worker making herself a nice little profit. There are plenty of properties out there for key workers but the system is so poorly run that a lot don't know about it.
