 In 1847 Tyrrell was offered and accepted the position of bishop of the newly created see of Newcastle, Colony of New South Wales.He sailed on 18 September 1847 with two clergymen, seven candidates for ordination, a schoolmaster and schoolmistress, his housekeeper, gardener and groom, with the wife and children of his gardener, 20 in all, and arrived at Sydney on 16 January 1848.The new diocese covered an area of more than and there were only 14 clergymen.