Okay, I've done the maths!
Selecting a few different Apple products, and pricing them up before addition of taxes, and comparing them to the US $ price.
View attachment 622443
As you can see, the UK actually does pretty well, with several products actually cheaper here. The biggest difference is indeed for the iPhone SE, at 4% more in the UK. But this can easily be accounted for by currency and import figures.
So in fairness, I think Apple has converted the $ amount, and
rounded up or down as needed to make the GBP a round xx9 figure!
Australia and Euro-countries such as Germany do slightly less well, however.
Only one product out of the seven I selected was cheaper in these countries than the US.
The remainder all saw an increase of up to 15%.
Again currency and import eat into that figure...
But I certainly don't feel this is as much of an Apple foreign-country markup tax as many are suggesting.