Mr. Paul Benson:

There are approximately 134,000 local authority houses in the country. At the end of the year, close to 80,000 houses should have benefited from retrofit, which suggests that 54,000 will remain. Some 24,000 houses of the 134,000, however, are less than ten years old and, therefore, the level of retrofit required will be different. The newer the house, the lower the level of retrofit that will be required, and vice versa. Perhaps 30,000 or 40,000 houses will require a deep retrofit, while the newer ones will require much less.