I've had no problem on BA with 2 misplaced letters in my name, and that was to SVO where they are very hot on checking passports, tickets and visas. I phoned up in advance to complain and was told it was policy not to re-issue where there were less than 2 'mistakes'. So, I wouldn't worry. However, if you are the stressed type, phone up and make a fuss until it gets sorted.