Arrestment in the hands of the Crown or of a Government department or of any officer of the Crown as such shall be competent in any case where arrestment in the hands of a subject would have been competent: Provided that nothing in the foregoing provisions shall warrant the arrestment of:—

1. (a) any wages or salary payable to any officer of the Crown as such;
2. (b) any money which is subject to the provisions of any enactment prohibiting or restricting assignation or charging or taking in execution; or
3. (c) any money payable by the Crown to any person on account of a deposit in the Post Office Savings Bank or in respect of a war savings certificate or national savings certificate.—[The Lord Advocate.]