On 6th April 2009 the Inheritance Tax threshold was increased to £325,000. it had been increasing steadily over a number of years since there was consternation among the general public that the level of the allowance would mean that the majority of people who had houses of a decent size would be impacted by the tax.
However, once it reached the level of £325,000 the amount remained static and there is no plans to increase it until at least after 5 April 2015.