Hi Joe,
Thanks very much, just located the entries you mentioned. I think I can dismiss the Boreham one but the Maldon entry sounds interesting as this is where William was settled with his family after marrying in 1873 (in Latchingdon I believe). It could just be coincidence, however he seemed convinced in the later censuses of .81 .91. 01 that he hailed from Haverhill. Perhaps his marriage certificate and birth, if I can find it, will reveal the facts.
Thanks
Nimrod