Hi
Thank you for all the help and suggestions folks. I doubt the original records I need exist any longer or Familysearch, Ancestry etc would have filmed/digital copies by now. Although the 1861 census states that William was born in Exning I'm not sure that this is correct. My ancestor, his son Thomas was born at Creeksea, Essex. I have a DNA match with a descendant of Joseph so believe I have the right family so far. I will investigate the Market Street family further. There is also a family at Great Waltham, Essex that may be a possibilty.
Thanks again, Matriach