According to the Guardian this morning:
Labour has a plan to use the first week of the campaign to undermine the basis on which the Tories would fund the inheritance tax cuts, especially the assumption that there are 150,000 non-domiciles on which a £25,000 charge could be levied to pay for the cut. Labour claims these figures are based on an article in Accountancy Age that is in turn based on an article written by an Observer journalist. Reliable as the Observer may be, it is quite a lot to base your main tax pledge upon.
Crikey. Given that I speak to most of the sources named here looks like this blog's got a significance I never planned.