Hello again moggygems,
Pity about George William of Shepton Beauchamp

But I guess it's always useful to rule out other possibilities.
You already had the 1901 census details.
I'll just list them again but in full this time as it might save other RootsChatters from searching for the complete entry:
1901 Millbrook Cornwall6 Trefusis Cottage
RG13/2186/17/26
George DARBY Head 36 <1865> Clay Quarryman b Taunton, Somerset
Susan do Wife 32 <1869> b Liskeard, Cornwall
Maud do Daughter 10 <1891>
George Son 4 <1897>
Mabel Daughter 3 <1898>
Samuel Son 1 <1900>
Children all born in Millbrook
And the full details of the possible 1891
1891 Millbrook Cornwall3 Heanton Place
RG12/1806/23/40
George DERBEY (might be DARBEY) Head 34 <1857> General Labourer b Somersetshire Marilan
Susan A do Wife 26 <1865> b Cornwall Liskeard
'Marilan' is very clearly written - I wonder if anyone knows where it is?
(Magdalen is the nearest I can find.)
I'm very hopeful of the Stoke Damerel marriage - given the Liskeard and Millbrook connexions of Susan POMEROY (however spelled).
Well, while you wait, let's hope someone can find George in earlier censuses ...
JAP