Thanks Ladylinda, that points to g.g.grandparents having a shop, but still no closer to g.grandads occupation - its Micks family and nan used to say that her dad, Thomas Latham, ran a shop, never thought to ask if it was his shop, or he just ran it, but nan used to say that she went to help out at the shop and she met her hubby when he used to visit the outdoor of the pub by the shop, none of which fits with the loco worker - I'm sure it is the right family, with Mary Ann and Thomas junior in 1911, nan wasn't born until 1914, there was also Ann b 1913 and younger sister Kath, b 1917, I think, so unless he went into shop work after the war, really don't know. He died in 1930 before nan married and nans mom worked as a live in housekeeper for a doctor after that.
Will have to hope some more info comes to light, I have written to the daughters of the doctor, who live in Canada now, to ask where they lived and see if they knew anything about the shop - nan kept in touch with them and we have exchanged cards since her death.
Thanks again Linda,
Sue