according to the story this morning, the problem with getting locals to work is that many can't commit to the length of the contract, which may be months, or can't leave families (some farms require workers to live on site). That makes sense - the most likely candidates are young and footloose.
Also:
//I contacted farmers individually and initially I was told by one farmer he’d take as many workers as he could get, so I went on radio and social media and got 150 people. I know I could probably find 1,000 to 2,000 here because people are out of work.”
He was then told by the farmer that he needed a gangmaster’s licence if he was going to place that many workers on the market, which he was told would take 10 weeks to obtain.
“By that time the fruit and veg will have rotted and the borders will probably be reopened,” he said.//
Though others have been told it's now five days.
So anyway, they're flying Romanians in
https://www.theguardian.com/environment/2020/apr/17/british-workers-reject-fruit-picking-jobs-as-romanians-flown-in-coronavirus