Apparently I need 20000 Avios + £ 1,250.96 for a return upgrade?
That's roughly what I'm getting, £1,210 + 20k Avios, LHR-IAD return in WT+ with MFU to CW.
Availability seemed quite tight on the random dates I used, although mid-week should be easier.
Unfortunately AA dont do any direct flights and I'm not that desperate to earn miles or TPs lol.
That's what I found too!!