The Equalities act of 2010 states that as a landlord you cannot discriminate any potential tenant with disability to rent out your property. This act means that you are not allowed to turn down disabled tenants if they want move in your rented property, you cannot disapprove even if you think that your property is not fit for them because of their disability.
The tenant is allowed to make some request for a few adjustments in the property for them to be able to live easier in it, such alterations will be carried out as the landlord’s duty to make reasonable adjustments in the property. If the tenant changes some parts of the property with your approval then it is understandable that at the end of the tenancy the property will be back from its original condition, the tenant’s deposit might be retained for this reason.
In an event that you refuse a tenant because they might not have a proof of employment of any capacity to pay the rent, then you don’t need to worry about it because disabled persons have their disability benefits just make sure they meet all the other requirements of the tenancy.
You can always contact your letting agent to clarify things and to give you advices for your obligations as a landlord of a disabled person.