Given that public bodies migrated to these contracts on an incremental basis from 1 October 2009 until 1 April 2010, the first full year where the majority of participating bodies received power via the national contracts is April 2010 to March 2011. For that year, we estimate that the contracts will deliver total benefits of around £10 million, with similar benefits achieved until contract expiry on 31 March 2013 - equating to around 5% of total contract value.