Oops indeed as the BBC reports:
The Information Commissioner is launching an investigation after the Conservatives accidentally sent details of 8,000 people to a radio station.
The e-mail sent contained the names, addresses, telephone numbers and intentions of voters in the Crewe and Nantwich by-election.
Deputy Information Commissioner David Smith said the disclosure, to Manx Radio, raised “serious concern”.
The Conservatives admitted a “mistake” had been made.
The information, which had been gathered by the Tories during the campaign for Thursday’s by-election, was contained in three Excel files, and was sent in an e-mail to Manx Radio by accident, potentially breaching data protection laws.