I have booked a discounted economy Virgin Atlantic flight to Montego bay Jamaica in May 2014 during their sale. My ticket is code is "o" and so I know I can not upgrade with my air miles. I was wondering if it is still possible to upgrade at the airport? I've seen signs in the past for upgrades to premium economy for around £190. I don't know if at that time of year (although it is before school holidays in the UK) there will be seats available at the airport! I just don't think the seats are worth upgrading now- I would have to pay an additional £300 to upgrade if I did so now!
I've bought extra leg room (I'm 5ft 9) so that extra leg room is the bare minimum I require but would like a few more inches in premium economy.