Datapoint East Anglian English/As what / than what in comparative clauses

Variety: East Anglian English
Feature: As what / than what in comparative clauses
Value: A - feature is pervasive or obligatory
Informants: Peter Trudgill

Examples

Example 406:
She ha' got a nicer one than what I have.
Example 407:
Thass harder than what you think that is