The low-wage EU citizens in the UK handled jobs the Brits wouldn't. Now that there is a shortage of them, Prince Charles has been encouraging furloughed Brits to do their share.
I always figured that was bollocks, the idea that the working class is too lazy or too proud to do certain jobs. Such claims by employers and right wing politicians need to be taken with a huge pinch of salt. Look at the agenda they are trying to push, and why.
People make the same sort of claims here in Australia. The reality is that Australians don't get hired for those jobs because they expect to be paid a proper wage and have reasonable conditions. Whereas foreign workers can be underpaid, pushed to do unpaid overtime, and they don't have the option to complain. Of course employers won't say "I don't want to hire Aussies because I'd have to pay them properly, I want to hire immigrants so I can exploit them and underpay them". So employers claim that Aussies don't want to do the jobs, and it's a claim that is difficult to prove or disprove.
Even in IT the same thing happens, we have huge numbers of IT workers unemployed in Australia or driving taxis or working as Uber drivers. The last company I worked for, they would put a new job ad up and within 24 hours they'd have 200 applications. But employers still claim that there is a skill shortage and they need to hire foreigners or bring in workers on temporary visas from the development centre in Bangalore (or some other foreign city). The skill shortage claims are pure bullshit. Most similar claims by employers in every industry are also bullshit.
The reason you never see an Aussie working in a Thai or Chinese restaurant in Sydney, or cleaning offices at night time, is because there are plenty of illegal immigrants and "students" who will do the job for $10 an hour or less (minimum wage is about $24 an hour for a casual worker). Of course you can pay an Aussie $10 an hour, but 6 months later he or she can take you to court and you'll have to provide a pile of backpay at the minimum wage and you will be up for costs and fines as well.