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Welcome to JA.
Your rights lie likley within your contract between you and the landlord where there was agreement for him to repair damage to the property.
If not within the contract then your rights is within the landlord and tenants act and the defective premises act, which imposes repairing obligations on the landlord.
Do you understand what I have stated if yes I will proceed to the next step
Obviously given the offer on the table the landlord is aware that he is at risk
With regards ***** ***** offer on the table I suggest you undertake the following steps
Yes given his failure to do so he is at risk
Once the local solicitors reviews the the documents and perhaps instructs a surveyor to review the property he can then advise you on whether to reject or make a counter offer
Do you understand what I have stated if not please let me know
Your welcome and have a good day.