At least this time he/she has the good grace to admit it.
"The poll Polly Toynbee cites today was carried out between 25-30 May. The one showing a ten point Labour lead was carried out between 17-22 November. I therefore concede that saying Labour was ten points ahead six months ago is an acceptable approximation, and withdraw the challenge to the statement."
At this rate (the site has only been going a few weeks), we will need a factchecking site just to check this obvious Polly smear campaign.