The CFTC recently announced several measures to increase market transparency, including more information sharing between U.S. and European markets and a re-examination of how certain index traders are classified.
If you're dependent on an index-linked annuity, the change being contemplated by the ONS could have cut its value by 15% over 20 years, with the cost widening every year.
To re-value the indicators of use of GDP at constant prices, relevant price indices (consumer price index, capital investments price index, etc.) and physical indicators were applied.