Hi Cherrybump.
Not sure if the rules are different in Scotland but you'll get the form from your midwife at about week 24. Your midwife doesn't need to talk you through it or anything you just hand it in at work.
Here statutory is 90% of salary for 6 weeks (although that depends on your weekly pay) then SMP for 30 something weeks and that is £135 a week at the moment. Your employers might have their own maternity benefit scheme in place.
Do you have an HR department at work? Or are policies somewhere for you to read?
I'm hoping to leave work 2 weeks before my due date if I can.