People angered by excessively high directors' pay are being offered a web tool that allows them to pressure pension funds, ISAs and other funds they have invested in to do something about it.

A large number of people are in funds which in turn invest in many large, listed companies to get a return on those investments. Campaigners have argued that those pension funds and investment vehicles that have significant stakes in companies have not done enough in the past to protest at directors' excessively high pay.

A new protest tool has been launched in the wake of 32 percent of Barclays shareholders choosing not to back their board over its directors' remuneration packages at the bank's recent shareholders meeting.

The tool, provided by the FairPensions campaign group and backed by the High Pay Centre think tank, emails funds a letter asking them to vote against high pay and bonuses.

The web tool is described as a "unique way to influence pay practices at the top".