Straight from BA! Have pretty reasonable business fares for midweek traveling if you're willing to go via another European city. I'm a student myself so recognise it's a good deal but still out of my price range unfortunately.

Defo recognise a same day airport upgrade would likely be a lot more - I was asking along the lines however of upgrading online as soon as I'd bought the econ/prem econ ticket? They often have a cash upgrade offer immediately after I purchase a ticket online from my experience with european flights?