Most of the migrant workers on our local farm live on a mobile home site provided by the farm, don't bring their families, never seen them in the GP's (I'm sure they are occasionally, but the farm may provide that service), so that just leaves hospital places, I haven't a clue about those.
They do pay taxes, shop in local shops and cause no problem whatsoever. If UK nationals could be found to do the jobs, they would be employed, the farm only gets a handful of UK applicants each year. Even the army of holiday pickers are now just a dozen or so caravans. Having been a picker back in the day when we needed the money, I can understand why no one wants to do it, it's darn hard graft.