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There is nothing unusual about a political campaign Tweeting out an image of a candidate at a phone canvassing session.

But the picture put out by Labour’s leadership contender Owen Smith’s team had a fascinating detail in the background.

On a whiteboard beside the candidate any eagle-eyed Twitter user could make out the web address, ID, username, and password required to log onto the Pontypridd MP’s phone bank system.

The campaign has more than 16,000 Twitter followers, more than a few of whom quickly brought the accidental leak of the details to wider attention.

It was quickly noted that the password – “Survation” – is the name of a prominent polling company.

The password was quickly changed

The campaign team sprang into action once they realised what had happened.

A spokesman told Buzzfeed : “These were the login details for our campaign phone bank system. The details were changed as soon as we were made aware of them being inadvertently posted on Twitter and the tweet was then immediately deleted.

“We can confirm that there was no data breach and the login details were not used by any unauthorised users.”

The incident will not stop Mr Smith and his supporters hitting the phones as the campaign enters its final phase.