Mike
1851 census: Susan Welch lived at 3 Willis Rd, Bromley, Tower Hamlets, with children Robert 4 and Jane? 2 (presume this is Susan Celia (have birth cert). Susan is recorded as "wife of a mariner at sea".
1856 Sept Death registration of Susan Welch in Poplar.
1861 census: Celia aged 12 was living with her Grandparents Robert and Lucy Welch at 6 Orford St, Ipswich, Suffolk.
Robert was aged 11, a Scholar at St Annes Society School at Streatham (described as a charity educating children of gentlefolk who have fallen on hard times particularly armed forces, clergymen etc.)
1871 census: Celia was a Drapers Assistant living at 281 East India Road, Bromley.
Robert aged 23 was a Clerk lodging at 18 Morant Street, Poplar.
1878 Robert got married in N London, described his father as Robert West Welch, Gentleman.
1881 census: Celia was living with her brother Robert and his wife Annie at 10 Pennyfields, Poplar.
1891 Susan Cecilia got married in Islington.
The grandparents meanwhile lived in Ipswich until they died 1869 & 70.
Thank you for your interest, it is making me go through this again, maybe I've missed something.