Stop trying to exploit immigrants.
how s he exploiting migrants, minimum wage is 7.50 an hour , he is offering 10, so if the guy works 10 hours a day he will be earning over two grand a month (if he works only 5 days per week) some 26k per year, ok tax and fees has to be paid but thats life, there is also government top ups , as in tax credits depending on circumstances.
But If its cash in hand and not invoiced the migrant will be in high cotton.