Hello, I am a solicitor with over 15 years experience. I will try to help you with this.
Are you confident that the external wall that the pipes are attached to belong to you. The wires serve the restaurant and whoever put them in this will amount to a trespass. Are you worried about the safety of the wiring or that it might be illegal abstraction.
There is a lot there. I have been in court all day and now need to go and pick up my children. I will answer later this evening.