Investors will be able to demand money back if Labour takes firms into public ownership, documents say.
Thames Water's Hampton Water Treatment Works, in SurreyImage copyrightGetty Images

Thames Water has told investors they will be able to demand their money back if a future Labour government renationalises the utility.

In a highly unusual move, the company outlined Labour's policy in stock market documents.

The filing said "future intervention" by the government could affect the company's ability to meet obligations.

Labour argues that taking water into public ownership would end "rip-off" prices and excessive dividends.

In a document to the Irish Stock Exchange, Thames Water highlighted Labour's policy of renationalising the UK water industry, along with others such as gas, electricity and the railways.