Mike
It would seem that the first Baptism at St John Sub Castro was in 1830, this gives a very good indication when the family moved to that part of Lewes.
1830 Oct 10, Gander Harriet, f, d of Henry & Harriet, OTP, Labourer
1832 Nov 4, Gander Jane, f, d, Henry / Harriot, OTP, Labourer
1835 Jan 11, Gander Elizabeth, f, d, Henry / Harriet, OTP, Labourer
1839 Jan 13, Gander Susannah Dennes, f, d, Henry / Harriet, OTP, Labourer
1843 Jul 16, Gander Esther, f, d, William / Chariety, Flint Row, Coach Painter
1843 Apr 23, Gander Harry, m, s, Henry / Harriette, Flint Row, Labourer
1845 May 18, Gander James, m, s, Henry / Harriet, Flint Row, Labourer
1846 Oct 25, Gander Edward, m, s, William / Chariety, John St, Labourer
1848 Aug 27, Gander Martha, f, d, William / Chariety, St John St, Labourer
1849 Aug 26, Gander Harriette Attwood, f, d, Harriette, Brook St, Single Woman
1850 May 26, Gander Margaret, f, d, William / Chariety, OTP, Labourer
1852 Apr 4, Gander Elizabeth, f, d, William / Chariety, OTP, Labourer
1853 Sep 25, Gander Henry, m, s, William / Charity, OTP, Labourer
1853 Jul 31, Gander Martha, f, d, Thomas / Jane, OTP, Labourer
1855 Oct 28, Gander Edith, f, d, William / Charity, OTP, Carrier
1855 Jun 24, Gander Mary, f, d, Thomas / Jane, OTP, Labourer
1857 Jun 28, Gander Mary, f, d, William / Mary Ann, OTP, Shoe Maker
1859 May 29, Gander Albert Henery, m, s, Mary Ann, OTP -
1859 Feb 27, Gander William, m, s, William / Charity, OTP, Labourer
1862 Dec 28, Gander Elizabeth Ann, f, d, Harry / Frances, OTP, Labourer
1862 Aug 31, Gander George, m, s, William / Charity, OTP, Labourer
1862 Jul 13, Gander Henry, m, s, Thomas / Jane, OTP, Labourer
1866 Nov 12, Gander Emma Jane, f, d, Richard / Susannah, OTP, Labourer
1867 Jun 30, Gander Harriet, f, d, Harry / Frances, OTP, Labourer
1867 Jun 30, Gander Harry, m, s, Harry / Frances, OTP, Labourer
1873 Nov 2, Gander Alfred, m, s, Edward / Emily, OTP, Labourer
1873 Aug 25, Gander William, m, s, Thomas / Jane, OTP, Labourer
1879 Oct 5, Gander Martha, f, d, Mary, OTP, Servant
1884 Nov 2, Gander Chariet, f, d, George / Mary, Brook St, Labourer
1884 Nov 2, Gander Charity, f, d, Edward / Emily, New Rd, Labourer
1884 Nov 2, Gander Edith Alice, f, d, Edward / Emily, New Rd, Labourer
1884 Jun 1, Gander Thomas Ernest, m, s, William / Mary Ann, 16 Brook St, Labourer
1885 Dec 6, Gander George, m, s, George Mary, Brook St, Labourer
1885 Feb 1, Gander Thomas Henry, m, s, Mary Ann, North Court, -
1889 Mch 27, Gander William Henry, m, s, George / Mary, OTP, Labourer
1890 Apr 6, Gander Charles John, m, s, George / Mary, Mount Cottages, Labourer
1890 Apr 6, Gander Elizabeth Mary, f, d, George / Mary, Mount Cottages, Labourer
1895 Mch 3, Gander James, m, s, Charles / Lucy Ann, ,1 Spring Gdns, Labourer
1898 Jun 5, Gander Edith Ruth May, f, d, George / May, 5 Pleasant Pl, Labourer
1899 Dec 3, Gander Sidney, m, s, Benjamin / Louisa, 1 Sun St, Moulder
1901 Jun 2, Gander Annie Florence, f, d, Albert / Cordelia Ann, 4 Spring Gdns, Bricklayer
1901 Feb 9, Gander Minnie, f, d, Charles / Lucy Ann, 32 John St, Bricklayers Labourer
1902 Sep 7, Gander Albert Edward, m, s, Albert / Cordelia Ann, 4 Spring Gdns, Brick Layer
1902 Aug 3, Gander Gladys May, f, d, Benjamin / Louisa, 2 Sun St, Moulder
1903 Nov 1, Gander William Alfred, m, Albert / Cordelia Ann, 4 Spring Gdns, Bricklayer
1905 Apr 2, Gander Ernest George, m, Albert / Cordelia Ann, 4 Spring Gdns, Bricklayer
1906 May 6, Gander John Henry, m, Albert / Cordelia Annie, 26 North St, Bricklayer
1906 Aug 5, Gander Margaret Esther, f, George / Mary, 5 Pleasant Pl, Labourer
1906 Mch 4, Gander Robert Edward, m, Benjamin / Louise, 2 Sun St, Moulder
1907 Jul 7, Gander Frank Charles, m, Albert / Annie, 23 North St, Bricklayer
1908 Jun 7, Gander Beatrice Annie, f, Benjamin Louisa, 2 Sun St, Moulder
Hope that helps with your research
Chris in 1066