In the meantime the first poor-law commissioners, appointed in February 1832, had drawn up their report. Nicholls had been especially applied to by them (through Mr. Cowell, one of the assistant commissioners) in the course of their inquiries, and the report, published in February 1834, contains frequent favourable references to the system in work at Bingham and Southwell, the principles ultimately recommended as the basis of legislation being those which had been advocated in Nicholls's "Letters by an Overseer". The
Poor Law Amendment Act 1834 was passed the same year, and in August Nicholls was appointed one of the three commissioners entrusted with its administration, the other two being
Thomas Frankland Lewis (later succeeded by his son
George Cornewall Lewis) and
John Shaw-Lefevre (later succeeded by
Edmund Head);
Edwin Chadwick was appointed secretary. Thenceforth Nicholls lived in London. The bank was very anxious to retain him at Birmingham, and he accepted his new office only under pressure from
Lord Melbourne, and at some pecuniary loss to himself. He remained a member of the poor-law commission until its reconstitution in 1847. The question of the Irish poor law in the meantime became urgent; no feasible scheme was forthcoming till 1836, when Nicholls submitted to
Lord John Russell, by request, certain "suggestions" on the subject. In June 1836, and again in the autumn of 1837, Nicholls was sent over to Ireland to inquire as to the best form of legislation. His two reports (dated respectively 15 Nov. 1836 and 3 Nov. 1837) were approved, and were to a great extent the foundation of the provisions of the
Poor Relief (Ireland) Act 1838. He was also, early in 1838, sent by the government to the Netherlands and Belgium to make examination of the mode of administering relief and the condition of the poorer classes in those countries. His report is dated 5 May 1838. Upon the passing of the Irish act he was requested by government to superintend the early stages of its introduction, and he accordingly proceeded in September 1838 to Ireland, residing, with his wife and children, at Lis-an-iskea, Blackrock, Dublin. He did not return to London till November 1842. The task of directing the working of the measure proved very difficult, and his efforts were hampered by party opposition. The Irish poor law and its administration were subjected to violent criticism, both in and out of parliament; but the bitterest opponents bore testimony to Nicholls's character and ability. On the reorganisation of the poor-law board in 1847, Nicholls became its "permanent" secretary, Lord Ebrington being appointed its "parliamentary" secretary. In April 1848 he was made a C.B., the appointment being one of the first batch following the extension of the order of civilians. ==Later life==