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Welcome to JA.
I am sorry to hear about your situation.
Is it the case the HA dispute that the damage caused is their fault or one the HA have simply not done anything yet?
Thanks for the further info.
It appears your father may have a nuisance and property damage cause of action against the HA given the escape of water which emanates from their property has caused damage to your father's property.
In view of this i suggest you seek to obtain the HA's insurance details as you can seek to claim via their insurance.
Alternatively you can file a claim on your father's insurance and they will get the matter fixed plus recover their losses from the HA's insurance.
Another route will be to hire a commercial lawyer to consider court action on your fathers behalf with a view of recovering both the property damage and your father contents damage too.
I hope i have clarified the position.
Thanks and stay safe.
Thank you again for visiting JustAnswer, please let me know if you need me to clarify the answer given.
Thanks and stay safe
Your welcome and have a good day.