My wife and I will be traveling in England and Scotland by train for three weeks in mid to late September. We are planning to get a Britrail pass (probably second class?). Our itinerary will be London to Bath to Moreton-in-Marsh to York to Penrith to Edinburgh to Inverness to Oban (by bus) to Durham to London. Should we get reservations on the trains we want to take, or is it safe to go without reservations? How expensive are reservations, anyway? Thanks for any advice.