Goodness me.
If you haven't seen this, where HAVE you been? All the updates are here:
http://coldwetnose.blogspot.com/
I am not an expert, never claimed to be, but for goodness sake, if you have a dog that guards its food please, please do NOT follow this person's techniques. It is a surefire way to get some teethmarks and to really, really confuse your dog. It won't teach them anything - except that they might just stop warning you to get off their food, and go straight for the bite instead.
Instead, please find a good local behaviourist or a trainer using modern, positive methods and enlist their help.
Resource guarding is a relatively common, and solveable problem - but Mr Shelley most certainly does not have the answer.
Shame on the BBC for promoting this.