During the first two years of war, it became clear that higher performance aircraft were needed and so a small number of Hurricanes and Harvards joined the unit in early 1941; they were soon followed by a flight of Tomahawks. Because of the limitations of the landing ground at Old Sarum, a larger satellite was prepared at Oatlands Hill, some away to the north-west. Oatlands Hill was equipped with only basic flying facilities and most of the maintenance work had still to be undertaken at Old Sarum, but henceforth all higher performance aircraft would carry out their training programmes at Oatlands Hill.