Baby boom puts pressure on England's primary schools
23 April 2013 Last updated at 07:40 BST
As parents find out which primary their children will go to in September, many schools are having to expand dramatically to cope with the number of pupils.
Gascoigne Primary School in Barking is the largest in England with a roll of 1,200 students.
The BBC's Tim Muffett visited the school, where classrooms had to be built on the car park to cope with growing numbers.