honeymoon baby eh??
congratulations!
To answer your question i think NI is paid after a threshold of about �100 so would not be paid if you were just on statuatory maternity of �108. Tax would depend of your tax code but doubtful itd be due.
if getting 90% of wages via your employer then you will need to pay tax and NI just as you would on your wages.
My figures are likely to be incorrect because its a while since i did payroll and i only took 2 weeks off after giving birth so i didnt get any maternity pay.