Why are 1000 newly qualified GPs unemployed in the UK while Australia is crying out for more?

Why are two basically similar health systems, 17,000km apart, producing different workloads and different employment opportunities for GPs?
According to one source, there are now too many GPs in the UK.
We all know the Australian situation — there are not enough GPs.
This is due to declining respect for GPs, increasing compliance, accreditation and management issues, and poor remuneration.