> Alternatively I send a wire transfer to a US bank, now I have to pay a fee (around about £25 flat fee plus a % on the exchange rate conversion from USD to GBP

> Alternatively I send a wire transfer to a US bank, now I have to pay a fee (around about £25 flat fee plus a % on the exchange rate conversion from USD to GBP, or I send it in GBP and let the receiver worry about converting it to USD). The wire transfer takes 5 days to acheive what was achieved using bitcoin in a matter of minutes. Right, but that's you as a small timer. Try holding a minimum balance of $250k in your Citibank account (which would be feasible for coinbase), and see what rates they give you for international transfers at that point. Hint: cents, not dollars, per transaction.