It's been three years since I flew long haul in Y, but I'll try to remember what it was like.

Seat pitch is 31in, dinner will very likely be a choice of 'chicken or beef?', and drinks are gratis. AVOD has been installed on the 744s, which is nice as long as it works. You'll find a blanket and pillow at your seat and a small amenity pouch containing socks, a sleep mask, a toothbrush with toothpaste, and a Change For Good envelope (go on, give a pound).

For much more info about upgr*des, see G-BOAC's excellent sticky, The BA Upgrade Guide.