I'm not sure what the people who claim "legitimate concerns", "worries about uncontrolled migration" and other such dogwhistles even want. I mean, I know what they want. They want the UK to be all-white and all Anglo-Saxon and everyone else to be kicked out. But do they realistically actually believe this is possible? It's not significantly more achievable than living forever or growing wings. So what's the point of all this? Do you want politicians to lie to you and say yes, darling, the UK can become a North Korea-style fortress with no immigration, we'll get onto it right away?
"We want to be heard! People want immigration to stop!" OK, but your wishes are fantasy nonsense. It's not possible to stop migration altogether and it's not possible to kick out every brown person who is already in the UK. All the contrary, as more wars kick off in other countries and more areas are made uninhabitable by climate change, there will be more foreigners coming to the UK, not fewer. And there will be more need for them, not less, because the UK workforce is depleted, ill and aging. So you can't have what you want. What do you want everyone else to do about it?
Short of shooting anyone who arrives at Dover, which I hope is not being proposed, others will still come over here if they want to and need to, because ultimately borders are an imaginary social convention and humans are a very stubborn and resilient hairless monkey species. Actually, even if you start shooting people at Dover, some, many, will still get through! Human beings will go through literally anything to achieve a goal, and you have no idea what some of the people resorting to illegal migration have been through, they're not gonna be scared by Dave from Wetherspoons.
I would also like to not grow old, never die, have ten million pounds, marry Brad Pitt when he was 25 and have invisibility powers. But guess what, it's not possible, so I'm not going out breaking windows and setting shit on fire to whine about my impossible wishes. Grow up, "people with concerns". FFS.