Found them in 1881 census, blimey didnt they get around.
15 Alexandra Grove, Chorlton On Medlock, Lancashire
John Slater 57 b Marston (Supervisor of Excise)
Susanna Slater 50(w) b Lowes, Cornwall
Lily H Slater 21 (d) b Worcester (Dressmaker)
Martha SK Slater 18 (d) b Scotland
Albert Fred Slater 16 (s) b Truro (Wharehouse Clerk)
Victor Josh Slater 14 (s) b Truro (Shippers Clerk)
Alberta A Slater 12 (d) b Truro
Wilfred W Slater 8 (s) b Plymouth
Not bad eh, hope this helps you in your searching.
All the best Ian in Plymouth