Yes, we should be concerned. Tuberculosis was all but eradicated in this country until fairly recently. The NHS website says this.
//Before antibiotics were introduced, TB was a major health problem in the UK. Nowadays, the condition is much less common. However, in the last 20 years TB cases have gradually increased, particularly among ethnic minority communities who are originally from places where TB is more common.
In 2011, 8,963 cases of TB were reported in the UK. Of these, more than 6,000 of these cases affected people who were born outside the UK.//