Myleene Klass and the Law

Myleene Klass was warned by Hertfordshire police against brandishing a knife to intruders on her property in order to scare them away http://www.guardian.co.uk/uk/2010/jan/10/myleene-klass-knife-intruders  . She was in her own home with her daughter upstairs (her fiance was away on business at the time). Does anyone see anything wrong with this?
To me, this just demonstrates how out of touch the law is with real life. I defy anyone not to do their utmost to protect family and property using whatever means possible, yet by doing so exposes you to the very real risk of being arrested. Whatever happened to an Englishmans home is his castle? In my opinion, the law has been grossly distorted in favour of criminals, many of whom know how to play the system in their favour. Now is the time for change, whilst I'm not advocating vigilantism in anyway shape or form, I do think we should be better protected by the law from counter actions by criminals who have had their just desserts after unlawfully entering our property.
What do you think?