A person who carries on a business (whether or not for reward or profit) of introducing people seeking work to employers must not discriminate—
(a) by failing to supply a service of the business, whether to a person seeking work or an employer seeking a worker; or
(b) in the terms on which a service is offered or supplied; or
(c) in the way in which a service is supplied; or
(d) by treating a person seeking work or an employer seeking a worker unfavourably in any way in connection with a service.