This game is not voiced, so we can't pick up on her accent, so it needs to be a little over the top IMHO. Would have loved it to have been like the English girl in Fraser.I'm not suggesting you completely change it, just tone it down a bit. Just less "I say, what splendid day!" and "jolly good lads" and "tally-ho" and "God save the Queen!"
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Btw. we absolutely loved Lindsay Lohan's awful English accent in The Parent Trap. Had us laughing helplessly.