Here's the deal. First of all there can be major differences in the taxes just based on the country you are booking from. I have run into this flying from the states to Germany. United and Lufthansa have a code share agreement. So when you look up flights from, say, Washington Dulles to Frankfurt, you will see a UA flight and a LH flight with quite a difference in final price, even though the base fare is the same. And if you look even closer, both are actually on the same fight. The LH flight is "Operated by United Airlines."
What it boils down to is what country you are buying the ticket in. You may be sitting in the US, but when you tell it you are staring in the UK, or you have a UK address, then you are buying the ticket in the UK.
The other problem with your first post is you said you found the same flight, but in reverse. So actually NO, you DID NOT find the same flight. Just because the routing has the same cities at either end means nothing.
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