With regards to 'at airport upgrades' I have a few questions...

I have not noticed the option to upgrade at the airport... do you have to request availability at check in? Are upgrades usually available if space permits or is it not as straight forward as that?

If you have an MFU'd CW seat netting you 75 TP's and you got a paid upgrade to F for £399, would that mean you would get 180 TP's even though it was an MFU? Thats assuming you can buy an upgrade for an MFU ticket?