to be honest? Not like they used to. I use my ba staff travel a lot to travel back and forwards to sydney (home). the only time I get upgraded to Club is if the CSD operating the flight has picked up (and taken sympathy of) my 'begging letter'.
World Traveller Plus has been our downfall as staff! Lol
generally pre WTP days you would get bumped from WT
to Club if they had to upgrade. Now it tends to be from WT
to WTP. They will generally only upgrade to Club if they really have to (ie down the back overbooked). This applies to both BA
staff and other airlines.