If you do not adhere to store policy (as long as it is shown somewhere in store), could she not then be charged with trespass? Maybe then the guard is within his right to ask her to leave?
Trespass is not a criminal offence.
Until she has made payment to Tesco for the banana and Tesco have agreed to the transaction, it is still property of Tesco, so by eating it, she could be charged with vandalism or destruction of private property.
Criminal damage is destruction of property without lawful excuse, intending to buy something is a lawful excuse.
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