Both mum and baby are doing well after PC Robert Morgan helped with the delivery after being flagged down in the middle of his shift.
The new baby girl doesn't have a name yet but she's happy and healthy.
More top news
Police are hunting for the owners of this jewellery which they believe is stolen
Police investigating the murder of a 20-year-old man in East London have named him as Moosakhan Nasiri.
18 year old Shafiq Smith was charged early this morning with the murder of Omid Saidy