It's a shame you didn't look at the answers to the question immediately below yours.
One of the pages on the link given there leads to this page on the DirectGove website -
http://www.direct.gov...ityrights/DG_10029290
This tells you all you need to know about maternity pay and the conditions required to be able to claim it. This is just the statutory part - your employer may offer you better (more) than this - ask.