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Without being able to poke around upstairs I don't know how to proceed. I'm going to contact management to get owner's contacts for above flat. If the guy above is just a tenant he's useless to us.
If water is coming from outside into wall cavity that dickhead at management should be interested enough to send a guy to protect the buildings.
If plumber ruins my walls just to tell me it's coming from upstairs, what then?
If it is external water ingress - eg outside wall/roof then its the *Buildings Management Company's responsibility.
*out of a service charge ?
if you keep getting fobbed off go through their complaints procedure and then here..
https://www.ombudsman-services.org/sectors/property/who-can-we-help