I've got a pair of tickets from the Uk to the US in W, which I would have thought was non-refundable, nor changeable as was quite cheap.

However, looking at the CO website, there are least a couple of links where I can process a refund - seems quite straight-forward, and implies to me are refundable. Now, being a bit more Savvy than others who might rush into this, I would read the small print, which mentions something about 'subject to fare rule'. However, what are the fare rules, and where can I find them?