That's where you and I part company Mair. I do agree that we need to train up more of our young people in certain areas. But having watched some mightily complicated operations and procedures on programmes like Hospital and 24 hours in A&E I cannot agree that 'foreign' doctors and nurses are less talented. I'm in awe of some of their skills. Some of 'our' best cardiac and paediatric surgeons seem to have trained abroad.
Likewise harvesting crops. In the village I used to live, the farmers relied on European labour, mainly Spanish. The workers arrived in late spring, took up residence in the caravans set aside for them, worked solidly until October then went back home. No problems at all. Only two lads from the village were regularly employed on the farms as the others preferred to be unemployed rather than work in the fields, though a lot of university students (my children amongst them) did add to the labour force during the summer months. Hard, back-breaking work it was, especially if harvesting courgettes which left your hands blistered.
And the same goes for cleanering and catering. Students and 'foreigners' mainly.