Originally Posted by
inOban
Reading his post I assumed that if he books, say, Islay to Glasgow, he gets the discount. But if he books Islay to AMS, or to his TCX holiday he can't find a way to still get his discount on the first segment, which he should be able to do.
Correct Islay - Heathrow on BA.com has a with and without ADS price that discounts the Islay to Glasgow leg (not Glasgow to Heathrow). Doesn't seem to be so for TCX or KLM.
On APD - my understanding for example is that you can do for example Inverness-Heathrow-New York for example and pay less APD than say Glasgow-Heathrow-New York and that people will actually position to Inverness to take advantage of this (saves a few hundred pounds if flying club world). When you try and do the equivalent on say KLM via Glasgow I thought the originating airport would determine the APD for the whole journey but seems not.