ShotOne
The 900hrs a year is a soundbite intended to make a pilots life seem easy. Job achieved on that score.
However, there is the 2,000 duty hours a year limit that not a lot of people seem to either know about or refer to. Unfortunately it doesn't have the required impact when you're trying to imply that pilots are under worked and overpaid!
BlueVikingFlyer - your 22 hour rest is mentioned in CAP371 however it is cunningly covered by the words "should be avoided". Oh how different life would be if the word 'should' was replaced with 'must'.