All secure, developed countries have 'underground' immigration which can be dealt with.
The amount of refugees we take compared to other (inc some smaller and poorer) countries is really quite small.
All the noise about it is sheer manipulation by the Tory party to get elected. To stoke up a fear of the 'other': vote for the nasty party and we will be nasty to the people you're scared of!!!
Why? Because their financial backers want to continue asset stripping the country.
I'm predicting another Tory gov next year.