m8, the same thing happened to me in my GCSE's: I got an A*. They are sent off as a batch of scripts from your school so it wont be a problem.
Don't worry, I totally buggered mine up once and put the centre number as the candidate number and all sorts all over and mine still got marked.
It's just to make things easier for your exams office I think!
I always get scared I do. It's with moving centres.
I contacted my exam officer! She wouldn't do anything though, just said that if there was a problem they'd call her!!!
And then she shut the door.
IS THAT IT?????
lol that once happened to my friend and they gave her an x because they thought she didn't do the exam...only joking it should be fine! Don't worry just speak to your exams officer
my brother put down the wrong candidate number on his.
once he got the results, he requested his script
and on the paper, the examiner had corrected his candiate number and it said "caniddate number changed by examiner" on the paper