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If the damage has been caused by the leaking roof, for which the Freeholder is responsible, he/the Company are certainly responsible for any damage caused to your Flat. That's the easy part of my answer.
The difficult issue is getting your money back for the necessary repairs. To be
nest, a claim would normally be made under the Block Buildings Insurance, and for this to be successful, it has to be evident that the damage was caused by the leaking roof.
I would therefore write to the Freeholder, putting him on notice that he is responsible for the damage and request that he contacts his Insurance Company. If he is not willing to co-operate, there should be a clause in your Lease stating that the Landlord is under a duty to provide a copy of the Buildings Insurance schedule to each Tenant, upon receiving such a request. Once you have a copy, you can write directly to the Insurance Company.
If, for some reason, this matter can't be resolved via the Insurance route, I'm afraid you would have no alternative but to issue small claims county court proceedings against the Freeholder for the damage caused.
I hope this assists you and sets out the legal position.