Every Commonwealth citizen or citizen of the Republic of Ireland—
shall, if his ordinary residence has been in the United Kingdom, be assessed and charged to income tax notwithstanding that at the time the assessment or charge is made he may have left the United Kingdom, if he has so left the United Kingdom for the purpose only of occasional residence abroad, and
shall be charged as a person actually residing in the United Kingdom upon the whole amount of his profits or gains, whether they arise from property in the United Kingdom or elsewhere, or from any allowance, annuity or stipend, or from any trade, profession, employment or vocation in the United Kingdom or elsewhere.