When tenant moved in 2 years ago we tried to get landlord insured which would cover her to carry out her holistic therapy business from the property. We could not get any. She agreed to find outside premises and would only use our house for occas pamper evening for her friends (non commercial). The tenancy contract forbids any business to be carried out. We have now discovered on Facebook that she intends to use our house and is advertising a full range of therapy treatments, taking bookings and issuing vouchers. What is our best course of action.