Tax credits are payments from the Government. If you are responsible for at least one child or young person who normally lives with you, then you could be eligible for Child Tax Credits.
More information can be found on this Goverment website: here 
In addtion, you can all the Child Tax Credit help-line number: 0845 300 3900. They will take you through the eligibility calculator and let you know if you qualify to receive child tax credits. Note: you must have a National Insurance number before you can be awarded Child Tax Credits.
For information about how to acquire an NI number, please see http://www.internationalstaff.org/ninumber.php
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