Nothing in this Part or Part II shall render unlawful measures maintained or adopted with a view to ensuring full equality in practice between employees, being measures -

(a) to prevent or compensate for disadvantages linked to any of the discriminatory grounds (other than the gender ground),

(b) to protect the health or safety at work of persons with a disability, or

(c) to create or maintain facilities for safeguarding or promoting the integration of such persons into the working environment.