You can contact the UKBA on:
Their telephone numbers are quite secretive.
You will need his name, date of birth and address if you have it.
In any event you could issue proceedings and seek an injunction against him for breach of contract which can include stopping talking about your business.
For this you would need a Solicitor to draft the papers and present your argument in Court.
But yes, you can contact the UKBA and take action yourself. The injunction would need to be served on this person personally as if he breaches it, he can be committed to prison.
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