That's one of the bulls' arguments, isn't it. "There's a fundamental lack of supply for housing in the UK. Less large families, more singles living on their own, more immigration..."
I think if you can pick an area with stable employment, sure there's high demand but fixed supply for houses where people want to live, but not at any price. Inflation is low. In order for yileds to increase, rents would have to increase, so incomes would have to increase, which I personally can't see capacity for.
Be interesting to see over next 6-12 months though.