Holed Drilled without Permission- Advice Needed

If you really care for your property as you say you do, then it would he wise to get all main services put in place before letting a property out. People like to watch TV. Just because they rent doesn't mean they should go without this basic service. My advice, tell your Tennant that your sorry you over reacted to such a tiny thing and that he is more than welcome to pop the cable back through but put a bit of sealant around the cable outside on the render.
I personally don't think your Tennant has done anything in the slightest that would he detrimental to the property and I don't blame him for not asking and just going ahead with putting the cable through as it's such a basic thing to do.

 

Do you let out the ground floor too? As id be furious about the hanging basket lol..

Get real..

 

Agree.

 

How do you know it was water proof mastic ? I would obtain a sample and send it off for testing