Not having a factory makes great business sense. Woodworm for example have only approx 10 employees. If they had a factory making their own bats that would increase massively, they'd also have to pay out for the land for it, employ skilled batmakers and other overheads. Instead they outsource it to China, India and other companies. I think it's Hunts County doing the refurbs on their behalf, they sell 40,000 odd bats a year so they're not doing bad bad without their own factory.
I was under the impression Kookaburra were purely a brand (although they used to make bats alongside GN until around 1990, when all were moved abroad), with the exception of the Kookaburra & Reader balls which may be made in Aus & England. I wouldn't be suprised if they had a small workshop for refurbs but didn't think they'd have anything like a factory.