I thought I had it all figured out and had even "attempted" to purchase GEX tickets online with the promotion code a couple weeks ago, which for some reason never went through or got charged to my card. Now I see that the promo has been cancelled. Perhaps that's why it didn't go through at the time.
So scratch those plans and begin anew. If we take the FCC from Gatwick to Waterloo (we're staying at County Hall), which route do I go, and also is it fine to wait and buy the tickets at Gatwick or should we reserve ahead of time? Our plane lands at 10:30 a.m. or thereabouts.