« Reply #1 on: December 06, 2012, 10:24:09 AM »
1) Welcome.
2) There are ways to use Avios (BA's mileage) where the taxes are quite minimal and the value is great (e.g. domestic short-haul). As for whether it's "worth it," only you'd be able to decide.
3) Many cards offer no forex fees. Not sure on the retroactive bit...
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2015: 116K bkd | 1.6M brnd | F: OZ,NH,AA,EK | J: UA,CA,TK,DL,TN,AF,VA | LIH,NRT,ROR,PEK,CNS,BOB,MEL,TLV & Pacific Hopper