From The Guardian comes this story of jobs no Briton will do:
On 24 June last year, the few hundred residents of a temporary village, hidden from view in the middle of a West Sussex soft fruit farm, received letters. They were signed by David Kay, the managing director of the Hall Hunter Partnership, a business that grows 10% of the UK’s strawberries, 19% of its raspberries and a whacking 42% of its blueberries across thousands of acres, of both glasshouses and polytunnels. The recipients were his seasonal workforce, some of the 3,000 pickers from Bulgaria, Romania and elsewhere who come here each year to get the harvest in, and without whom the business would simply not exist.
It seems the United States is not the only country in the world subsidizing low prices in the supermarket aisle by paying wages so low wages no native workers will do the job.
As it reported, around 20% of all employees in British agriculture come from abroad, these days mostly Romania and Bulgaria, while 63% of all staff employed by members of the British Meat Processors Association are not from the UK. Around 400,000 people work in food manufacturing here, and more than 30% of those are also from somewhere else. If free movement of labour stops, the British food industry won’t just face difficulties. Some parts will shudder to a halt. Shelves will be emptied. Prices will shoot up.
And it's not just pickers and packer jobs that are going to desperate foreigners, it's vet work as well:
[U]nder Food Standards Agency rules, an abattoir in England, Wales or Northern Ireland cannot operate unless the animals on the way to slaughter are overseen by one of their vets. This is work British vets don’t want to do. They would rather be out on the farm with livestock in the prime of their lives, or dealing with domestic pets. As a result, at least 85% of vets in British abattoirs are not from the UK. Apparently, the majority are Spanish. And if they couldn’t get into the country to do the job, the meat supply chain would collapse.