Thanks everyone for your time and effort.
Jack - I'm fairly sure they'd not reached Stirlingshire by 1851 anyway, unless it was a fleeting visit before heading back to Lanarkshire.
Jean - yes Isaac and Lucinda 1856 are mine. Isaac married the lodger Mary Ann Gallagher who also led me a merry dance till AndrewP helped me find her as Mary Ann Goricher
So they were in Chapel St Airdrie in 1841, Stirling Street Dunipace in 1861, George died in 1865 of a cut throat but Lucinda carried bravely on and was in Nob Row Dunipace in 1871. She died in 1879 in Stirling Row, Dunipace where Isaac took over as head of the family. I have all the children from abt 1838 to 1856 born in Airdrie area, then Thomas born 1859 in Dunipace, so it looks likely they are lost in Barony with Jean's rellies. Unless they're somewhere completely different for a few years then back to Lanarkshire.
They're quite a sad bunch really, what with George and his cut throat, son Edward killed at 14 yrs in a pit accident (I don't think they got his body out), a few weeks earlier Thomas had died aged 8.
Don't know about Lucinda Woods Jean. May be a realtive but I can't think who or what. Lucinda's death cert gives her parents as John Woods, farm worker, and Catherine McCann.
Thanks for trying - fingers crossed something will turn up eventually.
Best wishes
Pinkshoes