49. Where a claimant and one or more other persons are beneficially entitled in possession to any capital asset, other than a capital asset disregarded under regulation 47(3), they shall be treated as if each of them were entitled in possession to the whole beneficial interest therein in an equal share and the foregoing provisions of this Part shall apply for the purposes of calculating the amount of capital which the claimant is treated as possessing as if it were actual capital which the claimant does possess.