Possible Clues:

• Train from Soho travelling round west end of Central Line
• Hogwarts, e.g
• Conveniences erected to accommodate children in academy
• Group reportedly unruffled after onset of storm
• Train, second half of it getting left behind
• Sounds like lukewarm support for head of sixth-form college
• See 22 Down
• Student, at first, reportedly reserved in group
• Dean's employer
• Where to learn to be among the sharks