You are right there. Staff travel is unlimited so technically you could fly home to newcastle from stansted on your 3 days off but.....being as EZY is a low cost carrier and being as staff travel is at its most disasterous time ever, you will be lucky to find the flights you want at the staff travel rate.
At present, to fly anywhere on the EZY network on staff travel rates shouldn't cost you more than £30 return incl airport tax. That's approx £5 per way before tax. The best time to get the flights you want is 3 hours before you want to go, that way the booking computer will know how many seats are left onboard that flight and can determine if they can sell those remaining seats for the full price before offering them to crew.
I know that was a bit of a mouthful, but staff travel is a topic within EZY that people are very unhappy woth at the moment, but is being looked at by the right people.
Daniel