9. The register of shareholders of a company must be kept at its head office, except that—U.K.
(a)if the work of making it up is done at another office of the company, it may be kept there; and
(b)if the company arranges with some other person for the making up of the register to be undertaken on its behalf by that other person, it may be kept at the office of the other person at which the work is being done.