So do I inform my insurance company as well?
Unfortunately I have already informed my insurance company, do I still proceed with the formal letter to the agent and tenant, and if so should I get quotes for the repair work first?
I have sent an email to the agents saying that I hold them accountable for the damage. Just noted that you didn't have my country as UK, I assume that this might make a difference.
The tenants are indicating that they have been complaining about this since the start of their tenancy, I have requested evidence of this from the agents.