Hi
Sorry but some of your info is wrong, James moved to Maidenhead as I said sometime between the 1871 census and the 1881 census - in 1881 he was living in Grove Road,Maidenhead and in 1882, he married at St Luke's Church Maidenhead to Elizabeth Mace from North Moreton, all children except the first born James (1881 - North Moreton) were born while the family were living in Park Street Maidenhead, they lived at at least 2 different houses there, - no 18 and 37. Alice - 1883, Beatrice, 1884, Ernest 1887, Frank 1890, Nellie 1891, Herbert 1894, and William 1896.
Maidenhead used to be under Cookham Reg District until 1896 when it became a Reg District in its own right.
James was still living in Park street in 1911 census - still as a platelayer for the railway.
I have the tree back to a Nathaniel Warwick born about 1680 - married in 1700 in Wiltshire.
Julie