The economics for people to take a job as a Farm Picker just don't work if you live in a wealthy country like the UK. It's expensive to live here. Property is expensive. Rents are high. These and the high cost of living means seasonal work doesn't cover the months where there is no work. On top of that the cost of transport means low paid work in remote areas takes a big piece of whatever you earn. You're unlikely to be able to move closer as you will have family commitments or a partner working elsewhere, and you won't be making enough to have two homes.
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http://ninacriedpower.blogspot.com/2024/09/farm-labour.html