To ask the Scottish Executive how many households would be in fuel poverty if the energy performance of all homes were raised to Energy Performance Certificate rating (a) A, (b) B, (c) C, (d) D, (e) E and (f) F, income levels remained the same and fuel prices (i) remained constant, (ii) increased by 13%, (iii) increased by 19% and (iv) increased by 52%, also expressed as a percentage of all households.