Well looks like I've answered my own question.
Appendix II
Instruments required for:
(i) aeroplanes engaged in regular public transport operations; and
(ii) aeroplanes engaged in charter operations which have a maximum take-off weight greater than 5 700 kg
For Visual Flight Rules flight, the following instruments may be unserviceable:
(a) the attitude indicator required by paragraph 1 (k);
(b) 1 of the attitude indicators required by paragraph 1 (g) provided that the attitude indicator required by paragraph 1 (k) is serviceable or an attitude indicator has been provided to meet the requirements of paragraph 1 (i) and is serviceable;
(c) the turn and slip indicator or slip indicator and attitude indicator required by paragraph 1 (i).