I'm going to be in London next week and my husband will be attending a conference. I've been to London several times and have never been to Edinburgh (always wanted to go). I know that going for a day is crazy and that's not enough time to see this amazing city but I'm still seriously considering it. We're staying at the Holiday Inn Bloomsbury. If I took a flight from Luton, is it easy to get to the airport from the hotel? Can you get there via the Tube? Also, how long does it take to get there and how much time in advance would I need to arrive before the flight leaves? I'm prepared for everyone to tell me not to do this but I'd really like to make it work since it will cost me less than $100 including the bus fare into Edinburgh (not sure how much it will cost to get to Luton)!!! Thoughts?