“The nil starting rate of corporation tax has been removed. From 1 April 2006 all companies with taxable profits are liable to tax at a rate of at least 19% (Section 26, Finance Act 2006)” H M Revenue and Customs.
This new tax is of particular interest to Amateur Theatre Organisations, there are exceptions, but not enough. The link above goes to the relevant H M Revenue page of information. There is also a discussion going on in the forum about this.