Is it an NHS student bursary?
http://www.nhsstudentgrants.co.uk/
Quoted...
What happens if my circumstances change?
You should report any change in your financial circumstances (or your family's, where a parental or spouse contribution applies) to your college and to NHS Student Bursaries as soon as it occurs.
It is also your responsibility to tell Student Bursaries if you have to leave or interrupt your course before the normal completion date.
I'd check with them direct in case they are able to claim it back.