OK. lets get down to basics here. My biggest worry as a GA recreational pilot is arriving in the same bit of airspace at the same time as another flying machine!
Therefore, regardless of the whys and wherefores of air law etc. Why not call up the relevant frequency for the area that you are in or approaching. its common sense and polite! also and most importantly, it improves safety for everyone!
Rant over. By the way, this is a great bottle of wine!