We are taking our first trip to Scotland this summer and I haven't been able to find a single car rental place that doesn't charge one way fees. Hopefully one of those codes comes along...

Random sidenote: For that length of time if you were planning on getting a GPS you may want to consider buying one. If I remember correctly GPS rental costs for our trip were going to be about $120 for a 6 day rental. I can buy a refurb'd Garmin with US, Canada, and Europe maps loaded for $110. Not a huge difference for this trip but if you travel and drive frequently on vacation is can be a money saver