Thousands of asylum seekers are doctors � but we don�t know enough about illegal arrivals

We lack accurate figures for who comes in and out - and we don't know enough about illegal workers or their skills.

We don't know how many people over-stayed their visas instead of leaving.

And while some failed asylum seekers are removed, others choose to go.

We don't also don't know how much they might contribute to the economy, since asylum seekers are not able to work.