Bad weather,
This means: get more training on weather appreciation. The PPL training establishment doesn't deal with this bit too well.
Overcrowded airspace,
Not sure what this means. The mid-air stats are negligible, especially away from circuits at uncontrolled airports
Water and
Ditching incident stats are distorted because few carry rafts, and a lot don't have transponders, and most don't carry locator beacons.
Get-Home-Itis
No such thing. Everything we do, from the moment we wake up, is done because we feel pressured to do so. If you didn't feel under pressure to have a wee, you would not go to the loo. This is just a stupid "CAA safety presentation" expression which might be there to excuse poor training and poor currency. A pilot should be taught to make a competent decision on the technical data before him: weather, aircraft performance, etc. Like going for a wee, every flight is done under pressure - especially if there are passengers present.