Could this be Thomas Jeffery and family in 1851? I realise the birthplaces don't fit, but "Jane' could be Ganey, and Mark is the right age.
HO107/1903; Folio: 315; Page: 20
"In a tent", Lameath, Cornwall
Thomas Jeffry - Head - 23 - Basket Maker & Tin Worker - Warwickshire
Jane Jeffry - Wife - 23 - Weymouth, Dorset
Mark Jeffry - Son - 5 - Chard, Somerset
Lucy Jeffry - Dau - 3 - Bridport, Dorset
Benjamin Jeffry - Son - 1 - Devon
Henry Jeffry - Bro - 15 - Basket Maker - Voyes, Wiltshire
There's a note added against the entry: "Please to excuse this error. Egyptians." No idea what the "error" is!
Rambler