Mobile phone use while driving

[R E S T E C P]

There are some things I've never been sure about. I'm in Scotland in case it makes any difference:

1) If my phone is in a cradle/holder fixed to the dashboard, can I basically do whatever I want with it, as long as I don't pick it up? Can I play angry birds and post nonsense on PistonHeads while at a red light with a police car sat next to me? Can I press buttons on Google maps navigation while crawling in traffic?

2) How stationary do I need to be in order to pick up my phone and use it freely? Is it OK to be parked at the side of the road with the engine on? Or engine off but key in the ignition? What about sitting in my driveway with the engine on?

3) While driving (either moving or red light), am I allowed to take my phone out of my pocket and put it in the cradle, as long as I don't actually press any buttons?

[R E S T E C P]

Thanks but that's very vague and doesn't answer my questions.

eg:
Is pulling my phone out of my pocket and sticking it in the cradle considered "using" it?

"Safely parked" - Could a police officer say I'm not safely parked if the key is in the ignition (like when you're drunk and sitting in the car with the key)

And the most vague of all is their description of "hands free". If I want to change navigation settings on the phone, I would use my hands. Is that still considered hands-free because it's in a cradle?