The information requested falls within the responsibility of the UK Statistics Authority. I have asked the authority to reply.
Letter from Karen Dunnell, dated February 2009:
As National Statistician, I have been asked to reply to your recent question to the Chancellor of the Duchy of Lancaster asking what proportion of their income was spent by (a) the poorest 10 per cent and (b) the richest 10 per cent of the population on (i) food and (ii) fuel in the latest year for which figures are available (254113).
In 2007, the average weekly household expenditure on food, as a percentage of gross income, was 22 per cent for the lowest income decile group and 3 per cent for the highest income decile group. For fuel, the percentages were 11 per cent and 1 per cent respectively.
Estimates of expenditure on food and fuel are based on the Expenditure and Food Survey (EFS), an annual survey of approximately 6,200 households in the United Kingdom. Further information on the EFS is available in the annual publication ‘Family Spending’ which can be found on the National Statistics website