Daley
On the NATS Careers website it states you need 5 GCSE Grade C or above including English and Maths. I would presume it means English Language rather than Literature.
If you are successfull in getting through to college, you will at some point have to be assessed on your level of English Language. ICAO states you have to have a minimum of level 4 in the English Language in order to obtain a Student Licence. Hope this helps!