So... in order to prevent myself ( or anyone else in my position) from offending / upsetting anyone, can someone experienced in these matters please advise on what is considered acceptable/unacceptable.

From my own initial experience, i am baffled by the 'what next?' scenario.. the cpl are in the car next to me, have flashed their lights, ive got out slowly and remained at a distance... once they even opened the door but never acknowledged me or spoke... then closed the door and left! Did i miss something?

Please help?
Chapped from Chiswick.