12BExtrinsic evidence

12B Extrinsic evidence In proceedings to construe a will, evidence, including evidence of the testator’s dispositive intention, is admissible to the extent that the language used in the will renders the will, or any part of the will— (a) meaningless; or (b) ambiguous or uncertain on the face of the will; or (c) ambiguous or uncertain in the light of the surrounding circumstances; but evidence of a testator’s dispositive intention is not admissible to establish any of the circumstances referred to in paragraph (c).