Are there any obligations as a landlord if the tenant is disabled?
Landlords have to abide by the Equalities Act 2010, which covers various discriminations, including disability.
As a landlord you should agree to the tenant making minor adjustments to the property where necessary. For example, visual door alarm instead of a bell, handrails and special arrangements for rubbish storage etc. If you agree to the tenant carrying our works on your property to accommodate any special needs, it would be perfectly within your right to request the tenant to return the property in the same condition as it was at the start of tenancy at his or her own expense.
Although you can choose to not accept a tenant who is not in employment as they will not pass referencing (this is not discrimination), but you cannot refuse to accept a tenant due to receiving Disability Benefit (so long as the tenant meets all the other requirements). Otherwise this would be discrimination because of the tenant’s disability, i.e. he is unable to work due to the disability.