people migrate illegally from everywhere. you're suggesting the UK should fix what exactly? every undeveloped nation everywhere?
I mean, not on its own, no, and only those nations from which it's reciving the bulk of the immigrants. But long term that is the only viable option. As I understand it these are not people who are leaving their country because they particularly want to, they leave because things are so bad at home that literally risking their lives is better than staying. I imagine given the chance they'd prefer to stay at home, so at some point we need to help ensure that's possible.
In the mean time a refugee camp of sorts would allow them to remain in their own country and provide suitable housing etc, meaning they wouldn't have to leave in the first place.