In 1841 the restoration work was begun, instigated by Dean Merewether, and was carried out by Lewis Nockalls Cottingham and his son, Nockalls. Bisse's masonry, which by this time had been found to be useless, was swept away from the central tower, the lantern was strengthened and exposed to view, and much work was done in the nave and to the exterior of the Lady Chapel. When Nockalls Cottingham drowned on a voyage to New York in September 1854, George Gilbert Scott was called in, and from that time the work of restoring the choir was performed continuously until 1863, when (on 30 June) the cathedral was reopened with solemn services. Renn Hampden, Bishop of Hereford, preached in the morning and Samuel Wilberforce preached in the evening. In his diary, Wilberforce characterises his right reverend brother's sermon as "dull, but thoroughly orthodox"; but of his own service he remarks (not without complacency), "I preached evening; great congregation and much interested."