In the US with the unicom system it is usual to say Skyhawk 01 K ... just so as yer know that when somebody calls up Lear 55 M, it's just worth a little attention to how much quicker he can do everything than you ..... and he knows you are a wee bit slower than him.
I can't see any reason to do different.
Do you want to fly round calling Blue Sky 001 to pretend you are an airliner ?
