YOU better watch out, Santa's checking his list of whose naughty or nice and this year he has a little helper - a lie detector test.
Children visiting Croydon's Centrale shopping centre will see their honesty put to the test before they are allowed to see Santa.
A polygraph machine and an expert in spotting fibs will be on hand at the grotto all day.
In a trial at another Hammerson centre in Brent Cross questions included "have you been good this year?" and "do you tidy your bedroom?".
Katie Tucker, marketing manager at Brent Cross said: "We know that Christmas is a busy time of year for Santa and parents, so we decided to lend both a hand and check if children had really been naughty or nice, to make sure no one is telling fibs. The children of Brent Cross proved to be extremely honest, and we look forward to testing the kids of Croydon to see how they fare."
