UK tax revenues:

A lot of the article is too specific to be of value to you, but there is a very nice graphic near the end detailing sources of tax revenue (not sure if NICs are included in income tax). There is also some information on moves to harmonise taxes across the EU:

e-books set to be more expensive due to VAT changes

This comes at the time France drops its 75% top rate:

France drops 75% top rate