All estimates but shouldn't be too far off.
Population of the UK - 61,000,000
Membership of the National Secular Society - 9,000 ( 0.01% of the population )
Membership of the British Humanist Association - 7,000 ( 0.01% of the population )
Number of Catholics in the UK - 4,200,000 ( 6.8% of the population )
It's a shame that the media doesn't give column inches and airspace in proportion to the numbers of those professing 'secularism' rather than in proportion to the egos of some of their spokespeople? Some people can't stand to see the Catholics celebrating with the Pope visiting and really need to take a measure of their own significance.