My annual London vacation is coming up, and this time I will be joined by a
friend who will arrive a few days later than me. This is his first visit to
London, so he is a bit nervous about travelling in the big city. We have
agreed to meet in a Central London station since travelling down to Gatwick
to meet him is deemed to expensive and time consuming. I haven't done that
journey myself, so can you advice on how to

- buy the correct ticket
- get on the right train
- get off at the right station

He will be arriving at Gatwick Airport around 2pm on Monday June 14. We are
staying near Walthamstow Central. My reaseach shows that the cheapest fare
is £17 return with FCC to St. Pancras, which is convenient for the Victoria
Line.

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jhk