I hope you get this given how many years since your original post.
I am wondering whether your Seabrooks might be related to mine.
I have a John Seabrook b1831 m Elizabeth ?? before 1861.They only had one son (I can find) Alfred William b1865.All three were born in Marylebone but by 1871 had moved to Lambeth, Deptford and later Camberwell.
I am having a hard time finding any info about John and Elizabeth and have a vague suspicion that John might actually have been a William John, given Alfreds middle name and my family's habit of using the fathers first name as the sons middle one.
John was a plumber.
Does any of this match anything you have found about the family since.