Miss Klass, a model for Marks & Spencer and a former singer with the pop group Hear'Say, was in her kitchen in the early hours of Friday when she saw two teenagers behaving suspiciously in her garden.
The youths approached the kitchen window, before attempting to break into her garden shed, prompting Miss Klass to wave a kitchen knife to scare them away.
Miss Klass, 31, who was alone in her house in Potters Bar, Herts, with her two-year-old daughter, Ava, called the police. When they arrived at her house they informed her that she should not have used a knife to scare off the youths because carrying an "offensive weapon" – even in her own home – was illegal.
And what exactly was she supposed to do?
I presume any answer including the phrase "double tap" would not be acceptable to Plod.