I totally agree that the Priv system is unfair, I was an unlucky employee who started worked for the old Regional Railways on 7th April 1996 in my conductor training, and on receiving travel facilities I was only entitled to 75%Discount, where some former colleagues in the previous training group who started in early March that year received BR Free travel. I did check this on several occasions and was informed that the cut of date was 31/03/96 so by a single week I missed out!!!
However what I didn't know until recently is that a former staff member left Northern recently and went to work full time for a local heritage railway operation, and guess what receives National Rail priv travel by a BR Box card (Boxes all crossed out though)!