I am related to John Seabrook (b1820) mentioned.He married Jane Sells in 1841 and had six children. This John died in London in 1907 living with his youngest son's (Alfred) family in Willesdon.His second child (Johnb1843) married Ellen Thorne in 1869 and the family moved into London (Barnsbury/Islington) from Hemel Hempstead in 1870's.As far as I can trace from 1901 Census most of the family remained in North London.
I belive that John's mother (Ellen/Eleanor? b 1791) was born in Limerick, Ireland but have been unable to trace her maiden name in Parish Records. She died in Hemel Hempstead in 1862 a year after her husband John (b 1786).