Am I correct that if you make 4 z1 tube journeys in a day, then take the train from Farringdon to Gatwick, you will pay the z1-z2 cap + the cost of a single fare from Z1 NR to Gatwick?
What about if you made 3 z1 tube journeys, then travelled from Bank to Gatwick?
From what I can see a Z1 LU to Gatwick journey is priced the same as a Z1 LU journey plus the NR Z1 to Gatwick fare, so it seems that you should be charged £9.50/£17.50 off-peak/peak, plus the £8.10 z1-z2 cap, not the £12.20/£20.30 LU to Gatwick fare plus the z1-22 cap.
Is this correct?