
The overall opt-out rate in the 2011 Electoral Roll (with almost all rolls received) was 45%, down from 46% last year.
The highest opt-out rate at any local authority was South Gloucestershire's 82%, while the lowest was Newcastle upon Tyne's 17%.
Marketers use the edited electoral roll to verify their own customer data or to target potential prospects.
People were first given the chance to opt out in the 2003 Electoral Roll, which according to Callcredit, was marked by a 22% opt-out rate.