Not sure about 'over and out'... Shouldn't it be either 'over' or 'out'? (No point in passing back to the other party if you're not going to be there!!)
This makes interesting reading, and should be mandatory for all market traders:-
Apostrophe Use
(apple's, DVD's etc...)
I think only a passing mention was made about 'I' and 'me' - another common error I find irritating.