400 houses? Pah! Try 9380 and then I might listen.
http://www.hailsham-tc.gov.uk/neighbourhood-planning/
That's probably the scale we should be building at, and is sufficiently large to justify building all the infrastructure of schools etc...
If the OP drove from North Bersted (Bognor) through to Angmering, he'd know why ONLY 400 houses is almost unprotestable.