I was looking at going out 12-Oct returning 22-Dec.

I just saw EK at £2299 coach on the way out, business on the way back and wondered what the options were as the only thing I could find when researching was for free upgrades, no paid options.
The only experience with paid upgrade options at the gate I have is VS, which always have a set price for one class upgrade if you ask.

I think I'll go either Korean Air or there seems to be a good deal with Cathay Pacific for about £3100.

Thanks for the advice and the welcome!