Gedifroggy,
I cannot claim to know the answer to your question, but I can suggest something that might be.
The speed marked VA on the diagram provided by Zeke does not produce the JAR limiting load factor of 2.5. But the text appears to be describing the process for flight testing a prototype aircraft to establish its manoeuvre capability and perhaps VA.
If this is the case, then point A1 might represent an initial estimate for (guess at) VA. If the test at para ( C ) (1) is conducted at this speed and achieves a load factor less than the limiting value, then a slightly higher speed might be selected and the test repeated. This process will eventually lead to the identification of the speed at which A1 is directly below A, and the limiting load factor is achieved. This speed will be the true value for VA. Given the fact that the test involves pulling the stick back as quickly as possible, it would clearly be safer to start with a fairly low estimate of VA to avoid overloading the aircraft.
If the above suggestion is correct, then the diagram just represents one of the early stages before the true VA has been identified.