Under the Disclosure of Tax Avoidance Schemes Regime, promoters are required to provide information to HMRC about avoidance schemes falling within certain statutory descriptions. This must be done within five days of the schemes being made available or implemented.
Disclosure Statistics are published six-monthly on the HMRC website. The statistics can be found at:
http://www.hmrc.gov.uk/avoidance/avoidance-disclosure-statistics.htm