I think you have an ancestry visa confused with a
working holiday visayou can have $0 in the bank for an ancestry visa, you do not need to prove that you can support yourself
An Ancestry Visa is roughly 200 pounds - I paid $400 Canadian.
The process is very quick also - it should take under a week (literally)
All you need to do is provide proof (long form birth certificates) that you are born to a parent that was born to a parent who was born in the
UK (tongue twister)
As long as you have all the paperwork in order you should have your passport with visa in hand in a weeks time from when you visited Worldbridge.