After 10 years, I have seen at least 5 reorganisations which have always resulted in a cull of the workforce and the survivors being appointed to new roles. You have to stick to these new roles for 2 years, so just as you might be heading up, you will hit the next reorganisation.
The most recent reorganisation is acknowledged as the worst on record (2 extra days holiday given by way of apology), and they have left the organisation design in a mess. Sadly, they are crying out for true leaders with a better sense of direction. All they have are self interested climbers who have their vanity projects to make a name. BP used to be a Leader now it is a Follower of fashion and it will change every time the wind blows.
Financially it's not bad to work here, but a lot worse than it used to be, but don't expect to see that grow.