(Sorry if this has already been discussed - this thread is a bit long)
We do want to add GBP support. It's mostly a matter of finding a bank that will do it. But there's also an issue about whether we'd add GBP pairs or not. It'd be cool to have them, but it might fracture the already thin volume, so I think it'd be better if we could add GBP by way of a good GBP/EUR exchange rate, at least initially.
I'm perfectly happy to use GBP (or EUR if I have to) to access whatever the most liquid market is (and if it's USD then so be it). Have you considered running a single multicurrency orderbook for each digital currency (i.e. like on Gox where any XBT buy order can match against any XBT sell order, regardless of the fiat currencies the orders were placed in). In this way the less popular fiat currencies still access the same liquidity pool.
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Yeah, I like that way of doing it, but I'm not sure how easy that would be to implement for us. I'll add it to my list of ideas though.
Order matching gets complicated, I think, because one (
ETA: The nice aspect is that, if done right, then worst case I'm no worse off in terms of fees than if I'd been forced to convert my GBP to EUR before buying XBT - but if I'm lucky and the native XBT/GBP liquidity is there I might do slightly better.