The 'Grandparents in 1901 ... note the address links well with the 1911 find you mentioned ...
1901 - RG13; Piece: 516; Folio: 74; Page: 27 - Camberwell, St George
283, Albany Rd
George Cooper 43 Head Butcher & Scalesman born Warwick
Eliza Cooper 39 Wife born Middx, Hayes
George Cooper 18 son General Labourer Southall
Ellen Eliza Cooper 16 dau Hat Hand Fancy Work do
Thomas Cooper 13 son London City
Elizabeth Ann Cooper 10 dau Camberwell
Henry Harrold Cooper 9 son do
Florence Bertha Cooper 7 dau do
Edith Elsie Cooper 5 dau do
Alice Beatrice Cooper 2 dau do
Amy Blanchie Cooper 1 dau do
Soooooo, either your George changed jobs from 1901 to 1902 and got into the Railways - and aslo said his Dad did ...
OR ... the George Henry you found with this family in 1911 isnt the right lad ?
You say you couldnt find George the shunter in 1911 ?