Elvington during the war had 3 runways, all 50 yds wide, 20 at 1400, 26 at 2000 and 14 at 1400.
Bruntingthorpe was similar with 1x2000, and 2x1400.
Post-war SAC use was probably not as an operating base but a recovery base.
Remember that SAC had 1600 B47, several hundred B52 and several hundred KC97/135s. They all needed somewhere to land
Spilsby was one such airfield. OS mapping, once such restrictions were lifted, showed huge expanses of concrete aprons. The intention was simply to land on, taxi to the furthest available space and stop.
East Kirkby, was also available as an emergency landing ground until 1970. In 1964 its runway was resurfaced, painted, and line with fuelled oil-fired glims. Halfpenny Green was another 1960s ELG.