Thank you all for your right guidance.

While go throuhg some more doughts coming in my mind.

Pls let me know them.

Does parking allowed only the marked area?

some people told that "If the area which vehicle parked is no parking area put hazard signal".
Is it true?

Do need to put hazard signal if vehicle parked in actually parking area?

Do need swithch off ignition while get out from vehicle?

Can i ask to the officer to which direction i may go, If they wouldnt tel before the Junctions/Round about?