Jeacock mystery

One of my 2 x great grandmothers was Edith Jeacock (born about 1820) who married Henry Bell on 25 July 1841 at Trinity Chiurch, Islington, London.  
One of  my great grandfathers was James Brown, born about 1850 in London, possible St John's Wood.  From his marriage certicifate, his father was William Brown, a dyer.

The marriage register for Edith & Henry Bell reads

25 July 1841 Trinity Chiurch, Islington
Henry Bell full age bachelor carrier Abode St John's Place, Upper Holloway. Father John Bell, Carrier
Edith Jeacock full age Spinster Abode ~~~ Upper Holloway. Father Charles Jeacock, optician
witnesses John Bell, Eliza Bell

The 1851 & 1861 census records for Edith & Henry and their family indicate that Edith was born in London, possibly City, about 1816 - 1819. The 'best fit' baptism record that I have been able to find for her is 28 Jul 1824 at Catherine Cree church (near Aldgate) giving her paraents as Charles & Margaret Jeacock.and is annotated with a date of birth of 17 Jan 1817. The problem with this though is that Charles' occupation is given as 'tinker' whereas he was called an optician at her marriage.

A William Brown married a Margaret Jeacock on 14 March 1852 in the Parish Church in St Marylebone, London. They lived at 15 Henry Street, St Marylebone.  William has the right occupation (a dyer) to be my gg grand father and at the 1861 census he is recorded as having a son who could be my great grandfather James. I have been unable to find a birth record for James.

I am coming to the conclusion that this is "my" James, that he was neither baptised nor his birth registered, and that his parents were William Brown of 15 Henry Street and his first wife Caroline who died in 1850.  The family is discussed further here.

But who was James' step mother Margaret Jeacock?

Her marriage record to William reads

14 March 1852 Parish Church in St Marylebone, after banns.
William Brown of full age, widower, dyer, resident of St Marylebone. Son of  Rich'd Brown, Gas Inspector
Margaret Jeacock of full age resident of St Marylebone. Daughter of Jas. Jeacock Optician
witnesses Samuel Mayo~ and Elizabeth Best?

There is the potential that Margaret and Edith are sisters. But there is also considerable scope for confusion with several families having children, including two who are both Charles & Margaret Jeacock and can't live much more than half a mile apart. One of these families had a daughter Margaret of about the right age for the Margaret who married William in 1852.  But she said her father was James not Charles. I have been unable to correlate a Margaret of the right age with a father James. I need to do more work on before I can say very much more.

Thank you in anticipation for any help you can provide.

While every attempt has been made to ensure the accuracy of this information, it could contain errors.

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