Who will replace the EU immigrant workers after Britain leaves the EU?

Who will replace the EU immigrant workers after Britain leaves the EU? It’s an interesting question that many in the UK and Europe are now asking themselves. Who will work on the farms, factories, or hospitals, or even, in the pubs, restaurants and cafes, after Britain leaves the EU?
Before you answer that, ask yourselves, who did it before the 1st June 2004?
One answer is, many young people from the top five commonwealth countries did some of these jobs. Australia, New Zealand, South Africa, Canada and the UK, up till 2008, had a reciprocal agreement, whereby, they could live and work in each other’s countries, for up to two years.