Are you just interested in this one Mickleburgh or others. Have you by any chance found out anything about his wife, Frances. In the 1861 census she is shown as:
Frances Nunn, age 50 married to Edgar Nunn (54) a farmer of 32 acres, along with Frances, 17, Milliner and Kate, 15 Dressmaker both the wife's daughters. The ages don't quite fit with the 1851 census but they are close and I am 99% certain they are the same people.
As John lived until he was murdered in 1888, did she get divorced or did she just live with Edgar Nunn and changed her name or something else, I have no idea, do you?