We will be arriving at Heathrow airport and need to get to Derby on the same day. I am considering taking the train (can't face a long bus ride after the flight). I have figured out that I need to get a ticket on the Midlant Mainline that leaves from St. Pancras station, Now the fun starts. What exactly is the best wasy to get to St. Pancras. where the train leaves from. Will the construction still be a problem in May? Also what is the best type of train ticket. I have become very confused reading about all the different fares. Thanks so much if anyone out there knows the answer.