The following table gives details of the amount (in £ million) that local authorities in England reported they raised from the higher national non-domestic rates multiplier.
£ million 2005-06 306 2006-07 311 2007-08 133
BERR guidance
www.berr.gov.uk/files/file44544.pdf
on impact assessments states that they are not required where a predetermined formula, such as the rate of inflation, changes the rate of a tax.
No estimate has yet been made of the change in revenue accruing from business rate supplements as a result of the 2010 rates revaluation.