first.https://www.gov.uk/sure-start-maternity-grant/how-to-claim. You can reprint off the form to fill out and send it by post.
@Sam how did u show ur matb1form
I never had to show a MAT B 1 form for the sure start grant. Only to my employer. Couldve been because I already had a joint claim out with UC ( rarely get any help but jad a claim for when I was on maternity with my first) I only applied for the one off £500 grant. Which was with my first. Any other documents had to be uploaded via their page.
I'd contact your midwife to get another one redone x