Thanks for your reply.
Well, just because the Tenant has requested the Landlord to take action is no grounds for the Landlord/Agent to erminate the Tenancy. I'm sure you are aware of this.
The Notice is thereofr einvalid, and your friends should ignore it. Indeed, if the Agents push them on this, they would be guilty of illegal eviction, which is both a criminal and civil offence!
As regards ***** ***** if it is damp that is causing the problem (as opposed to the Tenants not opening windows/hanging up washing inside the property), the Landlord is under a duty to rectify the problem. The cheapest thing for your friends to do would be to contact the local Environmental Health Officer at the Council, who will come out and ascertain whether there is a "statutory nuisance" under the Environmetal Protection Act 1990. If there is, they can serve Notice on the Landlord , giving him 21 days notice to rectify the problem.
As regards ***** ***** caused by the damp,to the Tenant's belongings, I am afraid your friends would have to issue separate Court proceedings to recover their loss.
I hope this assists and sets out the legal position.
Please let me know if you require any further clarification.