There is one piece of information which is absolutely central to this.
Was the lease properly drafted, by a solicitor or suchlike and if so was there a clause in it which provided for the landlord to peacefully re-enter the property in the event that the rent was unpaid for 14 days whether formally demanded or not? It would normally be in most leases but it’s central as to whether this was an unlawful eviction or not. It is highly likely that the clause was in there and if it was, then there is no need for the landlord to give notice. You can simply wait until rent is 14 days late, he doesn’t have to make rent demand, and then he can simply lock the tenant out.
The actual reason for not paying the rent is not relevant.
It doesn’t matter whether the landlord had not done some repairs, your daughter is not entitled to withhold rent.
By the same token the landlord is not able to hang onto your daughters property and is entitled to be recompensed for the cost of however much equipment is in there, they will not return it and whatever the value of what is in the freezers is. If they will not allow access, then she needs to make an estimate and then sue the landlord for whatever that costs. There is little point in exchanging lots of correspondence which will only serve to increase costs without moving the matter falls.
Prior to 6 April 2014, the landlord could levy distress on goods left on the property, in respect of unpaid rent. After April 2014 that changed to an extent and they now have to give 7 days clear notice of their intention to exercise the remedy. Here is an article on the subject
Your daughter however still remains liable for the unpaid rent, any repairs which your daughter was liable to do under the terms of the lease, and also, the property rent after foreclosure, until such time as the landlord has obtained a new tenant. The landlord is under a duty to mitigate his loss by trying to get a new tenant.
Can I clarify anything for you?
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