My R.E Teacher is a senior examiner and sometimes she starts talking to us about the sort of things she sees every year.
Since she marks R.E she gets papers which are blank, but say I don't believe in God and stuff like that.....
Anyway, She marks History as well and my friend made the same mistake, but You shouldn't worry because Examiners want to give you marks, so they shall work out which question you answered.
The only issue is, Examiners can have a bad day and if you're paper pops up while they're in a bad mood, they can begin to mark harshly and stuff...