Small backstory: we're planning on getting married in Gretna Green, Scotland, next summer. His family will likely go up on the train (as will we), since it's fairly straightforward from the London area.
However, my family are starting to ask questions about the best way for THEM to get there. Some have expressed interested in perhaps to going to Scotland first to do some tourist-y things and then coming over to Gretna Green for the wedding.
Basically, what are the best/cheapest routes to Scotland from the US? Are there some key airlines they should look at for this? What's the biggest/best airport to fly into? I admit complete ignorance when it comes to travel in and around Scotland, since we're London-based. I had initially thought that the best thing to do was fly into London and then get the train. Manchester's not really viable as an airport, BTW, because there's no good trains from there to Gretna Green (it actually takes the same amount of time as the quickie train from London!!).
As a side note, my sister was asking about the possibility of going around the Scottish countryside to visit castles & the like. Are the trains any good for this? I can feel they don't really want to mess with renting a car (or maybe it's not so bad).
I'm outta my depth here, with the north! Hopefully the northern UK-Yers can give some good advice, please.