Q. My tenant has done some unauthorised work in the kitchen and my electrician tells me that the work has not been done properly. What can I do about this, and will I be liable if someone has an accident?

A. You won't be liable if any of the tenants are injured as a result of these works (as the problem is their fault) but it is possible that you may be found liable if someone else is injured. 

I would suggest that you write to the tenants (keeping a copy of your letter) making it clear that these works were unauthorised and informing them that they must make the electrics safe within a specified period of time.