The period for reclaiming gift aid is to be cut from 6 years to 4 years according to an article in Third Sector. This change take effect from 1st April 2010 and, according to HMRC, is part of a review intended to create a standard regime for all direct taxes.
More information on gift aid can be found on the HMRC website. Although traditionally gift aid has been thought of in terms of donations it can cover a wider range of transactions including in some cases membership fees. However, groups reclaiming gift aid need to be clear about what is, and is not, covered by the scheme.