Green Party leader Zack Polanski has admitted he may have failed to pay the correct council tax while living on a London houseboat.Mr Polanski had faced mounting questions over whether the houseboat, moored in east London, was his primary residence.The party originally said he stayed on the boat only "occasionally" but then issued an apology from Mr Polanski late on Monday night for what it called an "unintentional mistake".

Green Party leader Zack Polanski has admitted he may have failed to pay the correct council tax while living on a London houseboat.Mr Polanski had faced mounting questions over whether the houseboat, moored in east London, was his primary residence.The party originally said he stayed on the boat only "occasionally" but then issued an apology from Mr Polanski late on Monday night for what it called an "unintentional mistake".