If you could do internship in the UK, for that amount of money you would pay neither tax nor national insurance.

http://listentotaxman.com/260?time=12



You start paying income tax on any earning above £10,600 per year (£883.33/month) (@20%)
You start paying national insurance on any earning above £155 per week (@ 13.8%)

* amended*

https://www.gov.uk/guidance/rates-and-thresholds-for-employers-2015-to-2016