the chair, nowadays students don't want to spend their summers down on a farm, whereas people did years ago. My gran and her family all went hop picking in the summer or whatever passed for it back in the day. Now it's totally different, laziness on behalf of the Brits, backbreaking work some say for little reward.
But we have nurses being recruited from the Philippines, doctors too i expect, though that leaves a lot of home grown talent wafting in the wings.
there is no easy answer to the question about staffing, and we will have to see how it pans out after Brexit.
I suspect that it will carry on as normal, business as usual.