Well done Malcolm. Have to admit I was getting confused with the 1871 family in Edinburgh.
William Forsyth shows as a beer bottler in 1871, fits well with his occupation in 1871
Monica
Please don't laugh at me. Reason I found the London 1871 entry is because I made a mistake and clicked on the England census instead of the Scotland census. But at same time I know that this is due to them looking over our shoulder and helping. I've had this so happen so many times in the past, it is not coincident.
Anyway your finds Monica really cement the whole case - you found Barbara and Jane living with them and here those two were in 1851:
1851 Census
Parish ref 685 Edinburgh fo 737 page 13
2 East Broughton Place
John GRANT Head 45 Pianoforte Makers Foreman b Edinburgh Midlothian
Margaret GRANT Wife 38 Foremans Wife b Edinburgh Midlothian
John GRANT Son 16 Pupil Teacher Normal School b Edinburgh Midlothian
Marion GRANT Dau 10 Scholar At Home b Edinburgh
Barbara GRANT Dau 8 Scholar At Home b Edinburgh
Alexander GRANT Son 6 Scholar At Home b Edinburgh
Jane GRANT Dau 4 At Home b Edinburgh
Isabella GRANT Dau 2 At Home b Edinburgh
Isabella LUMSDEN Servt U 30 House Servant b Leith
Furthermore Marion had a father named John, and brothers named John and Alexander hence the names of her sons born Bermondsey.