I'm two-thirds the way through a lengthy oneworld Explorer where the final sector is LHR-JED. Only now, however, have I discovered that Saudi Arabia does not have a tourism industry. To get a visa you must be on business or visiting family; there's no such thing as a tourist visa. Serves me right for only looking for the best mileage!

So I'll have to incur the USD125 re-route fee which is fine. But where to go to.

I expect it will be DOH, DXB or AUH, only AUH of which I have not been to.

Will I have taxes reassessed on the entirety of the remaining itinerary (about six flights) or just the LHR-wherever? Is my understanding correct that QF and BA to DXB, BA to AUH or QR to DOH will all see me hit with a fair bit of tax (upwards of USD100), in addition to the USD125?