UK Tax Revenue Chart
Current UK Tax Revenue: 25.05% GDP
UK Tax Revenue for Dec 2014
Mean: 24.85% GDP
Median: 24.87% GDP
Min: 21.07% GDP (Dec 1973)
Max: 27.82% GDP (Dec 2008)

UK tax revenue (percent of GDP). Excludes most social security contributions.

Source: World Bank > UK > UK Tax Revenue