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The basic positions is that unless the landlord agreed to make adjustments suitable for your son to the property as a term (orally or in writing) then you will be bound by the length of the tenancy agreement. He is under an obligation to provide accommodation fit for human habitation, rather than habitation for a particular human (ie. your son) unless this was expressly agreed.
You can terminate under the break clause obviously, but the only other way you could terminate would be is the property is unfit for human habitation - this would be a repudiatory breach by the landlord which denies you all, or substantially all, of the benefit of the contract. In these circumstances one would usual invite he enviro dept. of the local authority to make an inspection in he hope they would declare it unfit thus entitling early termination.
The landlord is under a duty not to unreasonably refuse a replacement tenant that you can produce to him and if you think this is a possibility before the break clause then you can use www.gumtree.co.uk to attempt to find one. Private landlords use the service all the time.
If you are occupying the property under an assured shorthold tenancy and the rent is less than £25k then any deposit you passed to the landlord would have had to have been placed in a tenancy deposit scheme. If you have not received details of this then you should ask for them from your landlord. If it has not been so placed then you have right to apply to Court for the return of the whole deposit and a fine of three times the deposit amount payable by the landlord to you. You could use this as leverage to get him to agree to vacation prior to the break clause.
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