Their have been some recent developments regarding this.
Qoute from charity commission as follows -
Section 2 of the Act (which came into force in April 2008) lays down the requirement that in order to qualify as a charity an organisation’s purposes must be for the public benefit (in addition to being charitable). As a result all charities registered in England and Wales must now annually demonstrate to the CharityCommission that that they satisfy this requirement.
Charities can no longer relax safe in the knowledge that their intentions will be presumed to be for the public benefit. Prior to the introduction of the Act, there was a presumption that charities dedicated to the advancement of education, the advancement of religion and the prevention or relief of poverty were automatically for the benefit of the public.
So from now on, saying they promote the "advancement of religion" or the "advancement of education" will not be enough.
I saw a TV debate about 6 months ago that was discussing this and someone "from the charity commission" said that - it could be argued that not all religions are for the benefit of the public, and that an in depth analysis will be conducted over the next couple of years to ensure all registered charities actually do meet the requirements of the charter.
I hope the WTBTS (is it IBSA in uk??) get found out and lose the tax breaks they currently benefit from.
The Scotsman