The Exchequer effect of the announced changes can be found in the Budget Report 2009 in ‘Table 1.2 Budget 2009 policy decisions’ and in ‘Table A2 Other measures announced since Budget 2008’.
http://www.hm-treasury.gov.uk/d/Budget2009/bud09_chapter1_237.pdf
http://www.hm-treasury.gov.uk/d/bud09_chaptera_307.pdf
The announced changes are expected to affect the top 2 per cent. of tax payers in 2010-11.