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One of the main water companies serving Bristol has been forced to apologise after sending a letter to dozens of customers calling a man 'a tw*t'.

Wessex Water says it has launched an investigation after a letter was sent to around 70 people in Chippenham, Wiltshire, with a line in bold which read: "Tom Wysocki is a tw*t."

The company said the correspondence had been "tampered with" and the company was looking into just how this happened.

Twitter user Alana Burke expressed her delight at receiving the letter and its hidden rude message.

She wrote: "@wessexwater Really enjoyed reading your letter I received in the post today. May I congratulate @TomWysocki for being mentioned in dispatches."

Wessex Water's social media team replied to Alana's tweet within 30 minutes, apologising for the embarrassing error.

"Hi Alana, we're deeply sorry for the inappropriate language and any offence caused by this letter. We are currently investigating how this has happened," the company said.

In a more extensive statement, Wessex Water - which serves Bristol and a large part of southwest England - added: “A letter about water supply work was tampered with and contained some inappropriate language.

“We apologised to customers living in the residential street that received it. We’ve taken the matter extremely seriously and we’re taking steps to make sure it doesn’t happen again.”

A second letter was sent to affected customers on Wednesday, June 5, apologising again for the error.

It read: "You may have received a letter about forthcoming work. The letter was tampered with and contained some inappropriate language.

"We would like to sincerely apologise for the language used and any offence caused. We are taking the matter extremely seriously and we're taking steps to make sure it doesn't happen again."