I saw Robb and Elissa LOADS of Sky Travel this week.
I saw them quite a few times in the front row of coaster at SFMM on the " Extreme Rides " and " Worlds Greatest Thrill Rides " shows.
1. Yes, you only need to be 18 to book at hotel room.
2. Thorpe Park, Chessington & Legoland are all easily accessible using public transport from London.
THE ALTON TOWERS HOTEL ROCKS!!!!
If only i had the money to spare for this trip!
I'm from the UK, so if you have any specific questions i'd be happy to help answer them