People who voted Leave to prevent immigration and restrict freedom of movement were never going to get their wish. Brits simply won't do these types of jobs and the alternative is to have food rotting in the fields.
East European people do these types of jobs, because of the relative difference in wages between Romania / Poland and the UK - so it is attractive for them (at least for a couple of years).
Leave has caused so much damage, lost us access to the single market, smashed up our manufacturing industry - for nothing, all due to bigotry / ignorance and they still won't restrict immigration.