Well...
I've left it all a bit late really. I can't believe they can charge you for something you've officially paid for.
As I mentioned on another thread, it seems like I have to pay 10 per cent penalty, which I can deal with. I had no idea before about the point to point fare and can't see anything about in the conditions of carriage.
I am supposed to fly to Beijing in three days time, and then from Beijing to London (home) the day after. That is the last valid day of my ticket. I don't even have the visa for China if I wanted to fly there now. And I've already bought a separate flight to get home later.
I guess all I can do is cancel my reservations for the last two flights and hope that they don't charge more than the 10 per cent.