I've just downloaded all the BDM for Abram and Abrams from the FreeBDM website as I'm looking into both names in Northants and Leicester in the late 1800's through to the 1910s.

I have census records showing my ancestors as born as follows:

Edward 1871
Silas 1872
Sarah 1876
George 1877
Walter 1879
John 1881
Mary 1882
Albert 1884

I can find no reference to any of them on the BD lists. Is it usual for it to be so inaccurate?